View allAll Photos Tagged Timer
I just deleted this album then re-loaded it to un tag a dealer i have problems with and to blow off steam about his companies' problem. it won't take the wind out of my sales for the love of life on the road. I just spent the last two hours deleting tags to dealers I’ve made large purchases from. The next step is to take their name off of my Truck and Fifth Wheel! That will teach them! I’ve even deleted two entire albums of photos with tags leading friends to the dealerships. My small protest but to have to spend more money in civil court. There should be a court for dealing with consumer products after large purchases and problems exist. Who can afford to do that and or spend the time teaching the bad dealer a lesson! It’s hard when you live on fantasy island and want to believe there are people out there that are true pros and true craftsmen. I know there are a few people out there because I met them and refused to do business with other dealers because I met them too. I’ve seen a guy weld a Holiday Rambler that broke in half over night at the frame and get me back on the road. There is even an RV dealer five minutes from my house that did such a poor job on a 30 foot trailer I want to restore that they lost a ten-grand restoration job! I went elsewhere for a purchase. Where is Brett Michaels when you need him! Now to find the proper venues to vent. Do you think the dealer’s sites post bad reviews? I’m the perfect sucker for a Salesman that cares nothing but for the commission or if they aren’t paid on commission for the BS they lay on you to kill time to eventually close the sale. I shopped for years at many different places within the State and even some Florida dealers for the right RV for me. I have twenty years’ road experience with travel trailers in and out of campgrounds and dealers. The hard part is when you find a good mechanic you are often down the road on the next adventure. The dealer can’t take away my enthusiasm for the joy of my new trailer. They are so useful when built properly and so versatile for travel or events or full time Road Warriors! Who wouldn’t be frustrated when there are 18 jobs that need attention! I was told by the salesman I’d get a good education from top to bottom and the demo guy was going to send me out of the dealership with the fifth wheel receiver or jaws ungreased with no Teflon pad for the fifth wheel! I really needed a fifth wheel hooking and unhooking lesson along with good Hydraulic jack lesson. I was good for most other things except how the solar panel works. But they try hard to push you off on the useless manuals or Destruction books because they are over worked and under staffed in the service area. I get that. Except learning the hard way almost cost me my hand with a bed and the fifth wheel. Luckily I’m quick. Sometimes I don’t know if I should have been a great mechanic a teacher or a great lawyer. I walked HIM through greasing the B&W hitch and greasing the receiver and made him put the Teflon pad he was going to make me leave without that I bought two years ago in anticipation of having a fifth wheel from Mark (the good guy) at the RV show in Greensboro. No kidding, I put a lot of thought into this. Needless to say, he has mechanical skills beyond my capability and they used the excuse it was market time or the RV show to be short with me. Now that I have tested things on the trailer before a trip and found at least 18 jobs that need to be done after waiting for a call for parts that had already been delivered and a call never received then accused of not paying for screens that didn’t fit and that a $125.00 per hour fee was going to be charged, who wouldn’t be upset? Did I mention this? It will always be something! They can just put the nail in the coffin for the common belief that it is over after the Sale is done. Getting passed off from one department to the other is unforgiveable! The excuse is familiar. I just do Sales; you have to talk to Service. Service says we just do Service, you have to go to parts. Even with lifetime warranty printed and tagged all over the trailer with a promise to teach you about how everything works I’ve found out the hard way from a popular dealer in Rural Hall, NC that it is not the case! It’s too bad I didn’t buy my Truck or RV and drive all the way to Atlanta to deal with @Scott Trail or find a similar friend that would make sure everything is right. Dream on Consumer! So, if any name bashing starts remember we always have one friend in the car, RV, insurance or Sales business. When we overall call all Salesman assholes or all insurance companies thieves or all dealings with service mechanics complete disasters we have to remember we have people on our friend’s lists that have those jobs. You know what, right now after a huge purchase and being shuffled it’s amazing I can work up any mercy for any of them. I’ve tried to be a Salesman. Service over profit was my downfall. I’ve tried to be a Customer Service Rep. It was difficult talking to people that needed parts after a large purchase when you just learned there aren’t any parts! We are all selling something whether we know it or not. If you aren’t taking pride in your job to be the best you can be and just killing time you are a part of this problem! Not everyone has a dream job. But it is just my turn to take a punch, but I’m swinging back! It is just unfortunate for them I know a little about RVs. I must have too high a standard to believe that there are really people that give a damn about products or follow through after the sale. I hate that we just don’t care attitude that leaves you searching for a better place. I had a place in Mooresville that I will find again for service. Hopefully the same family runs the place. It is near the Lake in Terrell. I need to return to and find another mobile mechanic once that moved on to a dealer in the mountains and I can’t dig his name up. There are good people out there. They are so hard to find. Maybe it is just me. I expect too much after laying down a hard-earned wage or a life savings for a house, new car, recreation vehicle or piece of equipment that is supposed to work. When I get a new toy, I want to take a photo of every nut bolt and screw on it, one because I am proud, the other reason is for future reference when things fall apart. Buyer’s remorse sucks even if you know the term all too well, Buyer Beware! I saw one guy at the current dealership I am dealing with now running, literally running to get from customer to customer after my purchase. In between him and the good mechanics are problems! The good guy’s name is Mark. He is extremely smart and knows RV’s and fifth wheels up and down. He was literally running with a ladder and carrying three heavy hitches with him to try to wait on at least two customers at the same time. I’m always leaving a window or looking for the good and hoping I’m not back on fantasy island. There were excellent qualified educated trailer technicians in the service in a good building with the right tools to build trailers from scratch, including paint. Getting to them is a full-time job on the customer’s end. They even had parts delivered that they owed me on what they call a we owe and hadn’t bothered to call in a three-week period. They wanted to double charge for some bug screens around 50 bucks until I produced a paid receipt. Even after the Salesmen told (I know his name) the parts manager he personally sat with the mechanic for a half hour trying patiently to put on the wrong screen. Even with lifetime warranty written all over my trailer they wanted to charge me for service $125.00 per hour for labor. That must be some sort of trick. For $125.00 an hour most any parts should be free! I waited three hours even with a scheduled appointment to even get told they were ready to take her in. Two days later I had to force the call to get an eta on when she would be ready. Imagine if I were a full timer living full time in my RV or still doing three shows a day in three different cities a day. Fortunately, I am gifted with a little time. The service manager mentioned to do the 18 jobs I needed to be done he still had to order parts. Imagine I was sold a unit that I (The Customer) found at least 18 things to do after leaving the lot and running the unit. So, I am going to rescue my unit tomorrow and hope what they did fix after two days waiting can get me through my first trip until parts come for the rest of the job. Do you think I am a fool to take it back? It is a hard call! I’ll know tomorrow if I receive a bill or the trailer is in good shape. The tough part is, after you have been tough with service now your unit is at their mercy. I was told by a good agent I don’t take any crap from anyone. But sometimes it costs me. But those of you that are passive and just let them walk all over you take a bigger beating. With full time jobs or people that depend on their unit as a full-time vehicle you can imagine the pressure to change up vacation times or deal with time off from your job to take care of problems.
A pair of 1950's old timers having a rest between heritage duties.
On the left is a 1952-built Guy Arab III with Roe body, No.139 in the Sunderland Corporation fleet and UK registered CBR 539.
This bus was one of a batch of twelve purchased by the Corporation in 1952 to provide tram replacement services in the Grangetown area of the city.
The vents on the front of the bus are the experimental Cave-Brown-Cave heating system which was fitted to the bus in 1959.
The bus was withdrawn from service in 1972 and has been owned by the North East Bus Preservation Trust since 2000.
On the right is a 1953-built Leyland PD2/12, UK registered RTC 822. The bus is powered by a Leyland 0.600, 9.8ltr engine.
This bus was new to Rawtenstall Corporation (Lancashire). It was acquired by Quantock Motor Services Ltd in 2009 as part of their working heritage fleet and moved into preservation in 2020.
It is seen here, in preservation, in the livery of Scout Motor Service of Preston (Lancashire). It was never actually owned/operated by them, although they did have a similar Vehicle.
Copyright © 2026 Terry Pinnegar Photography. All Rights Reserved.
THIS IMAGE IS NOT TO BE USED FOR COMMERCIAL GAIN WITHOUT MY EXPRESS PERMISSION!
St Machar's Cathedral (or, more formally, the Cathedral Church of St Machar) is a Church of Scotland church in Aberdeen, Scotland. It is located to the north of the city centre, in the former burgh of Old Aberdeen. Technically, St Machar's is no longer a cathedral but rather a high kirk, as it has not been the seat of a bishopsince 1690.
St Machar is said to have been a companion of St Columba on his journey to Iona. A fourteenth-century legend tells how God (or St Columba) told Machar to establish a church where a river bends into the shape of a bishop's crosier before flowing into the sea.
The River Don bends in this way just below where the Cathedral now stands. According to legend, St Machar founded a site of worship in Old Aberdeen in about 580. Machar's church was superseded by a Norman cathedral in 1131, shortly after David I transferred the See from Mortlach to Aberdeen.
Almost nothing of that original cathedral survives; a lozenge-decorated base for a capital supporting one of the architraves can be seen in the Charter Room in the present church.
After the execution of William Wallace in 1305, his body was cut up and sent to different corners of the country to warn other dissenters. His left quarter ended up in Aberdeen and is buried in the walls of the cathedral.
At the end of the thirteenth century Bishop Henry Cheyne decided to extend the church, but the work was interrupted by the Scottish Wars of Independence. Cheyne's progress included piers for an extended choir at the transept crossing. These pillars, with decorated capitals of red sandstone, are still visible at the east end of the present church.
Though worn by exposure to the elements after the collapse of the cathedral's central tower, these capitals are among the finest stone carvings of their date to survive in Scotland.
Bishop Alexander Kininmund II demolished the Norman cathedral in the late 14th century, and began the nave, including the granite columns and the towers at the western end. Bishop Henry Lichtoun completed the nave, the west front and the northern transept, and made a start on the central tower.
Bishop Ingram Lindsay completed the roof and the paving stones in the later part of the fifteenth century. Further work was done over the next fifty years by Thomas Spens, William Elphinstone and Gavin Dunbar; Dunbar is responsible for the heraldic ceiling and the two western spires.
The chancel was demolished in 1560 during the Scottish Reformation. The bells and lead from the roof were sent to be sold in Holland, but the ship sank near Girdle Ness.
The central tower and spire collapsed in 1688, in a storm, and this destroyed the choir and transepts. The west arch of the crossing was then filled in, and worship carried on in the nave only; the current church consists only of the nave and aisles of the earlier building.
The ruined transepts and crossing are under the care of Historic Scotland, and contain an important group of late medieval bishops' tombs, protected from the weather by modern canopies. The Cathedral is chiefly built of outlayer granite. On the unique flat panelled ceiling of the nave (first half of the 16th Century) are the heraldic shields of the contemporary kings of Europe, and the chief earls and bishops of Scotland.
The Cathedral is a fine example of a fortified kirk, with twin towers built in the fashion of fourteenth-century tower houses. Their walls have the strength to hold spiral staircases to the upper floors and battlements. The spires which presently crown the
Though worn by exposure to the elements after the collapse of the cathedral's central tower, these capitals are among the finest stone carvings of their date to survive in Scotland.
Bishop Alexander Kininmund II demolished the Norman cathedral in the late 14th century, and began the nave, including the granite columns and the towers at the western end. Bishop Henry Lichtoun completed the nave, the west front and the northern transept, and made a start on the central tower.
Bishop Ingram Lindsay completed the roof and the paving stones in the later part of the fifteenth century. Further work was done over the next fifty years by Thomas Spens, William Elphinstone and Gavin Dunbar; Dunbar is responsible for the heraldic ceiling and the two western spires.
The chancel was demolished in 1560 during the Scottish Reformation. The bells and lead from the roof were sent to be sold in Holland, but the ship sank near Girdle Ness.
The central tower and spire collapsed in 1688, in a storm, and this destroyed the choir and transepts. The west arch of the crossing was then filled in, and worship carried on in the nave only; the current church consists only of the nave and aisles of the earlier building.
The ruined transepts and crossing are under the care of Historic Scotland, and contain an important group of late medieval bishops' tombs, protected from the weather by modern canopies. The Cathedral is chiefly built of outlayer granite. On the unique flat panelled ceiling of the nave (first half of the 16th Century) are the heraldic shields of the contemporary kings of Europe, and the chief earls and bishops of Scotland.
Bishops Gavin Dunbar and Alexander Galloway built the western towers and installed the heraldic ceiling, featuring 48 coats of arms in three rows of sixteen. Among those shown are:
* Pope Leo X's coat of arms in the centre, followed in order of importance by those of the Scottish archbishops and bishops.
* the Prior of St Andrews, representing other Church orders.
* King's College, the westernmost shield.
* Henry VIII of England, James V of Scotland and multiple instances for the Holy Roman Emperor Charles V, who was also King of Spain, Aragon, Navarre and Sicily at the time the ceiling was created.
* St Margaret of Scotland, possibly as a stand-in for Margaret Tudor, James V's mother, whose own arms would have been the marshalled arms of England and Scotland.
* the arms of Aberdeen and of the families Gordon, Lindsay, Hay and Keith.
The ceiling is set off by a frieze which starts at the north-west corner of the nave and lists the bishops of the see from Nechtan in 1131 to William Gordon at the Reformation in 1560. This is followed by the Scottish monarchs from Máel Coluim II to Mary, Queen of Scots.
Notable figures buried in the cathedral cemetery include the author J.J. Bell, Robert Brough, Gavin Dunbar, Robert Laws, a missionary to Malawi and William Ogilvie of Pittensear—the ‘rebel professor’.
There has been considerable investment in recent years in restoration work and the improvement of the display of historic artefacts at the Cathedral.
The battlements of the western towers, incomplete for several centuries, have been renewed to their original height and design, greatly improving the appearance of the exterior. Meanwhile, within the building, a number of important stone monuments have been displayed to advantage.
These include a possibly 7th-8th century cross-slab from Seaton (the only surviving evidence from Aberdeen of Christianity at such an early date); a rare 12th century sanctuary cross-head; and several well-preserved late medieval effigies of Cathedral clergy, valuable for their detailed representation of contemporary dress.
A notable modern addition to the Cathedral's artistic treasures is a carved wooden triptych commemorating John Barbour, archdeacon of Aberdeen (d. 1395), author of The Brus.
8-16-2010
You don't see this method of raking hay into windrows with all the modern farming equipment. This gentleman uses all old or antique equipment to harvest the hay and grain he uses to feed his workhorses.
This was the first camera I purchased back in the late 80's. Behold... the mighty YASHICA FX-3 Super! The word "Super" tells you it's good. NOW, with a built-in light meter and blazingly fast 1/2000th of a second shutter speed.
A quick self-portrait taken just before I left for the wedding. Few self-portraits show me with any sort of smile, since I usually am struggling with apertures, distance, self-timers and such. But this was shot from the hip on a happy day.
I put the timer on 13 minutes. It takes longer if the eggs are straight from the refrigerator. Even then it's still faster than the old method of putting eggs in cold water, bringing it all to a boil, and then letting it cool for twenty minutes.
IMG_3880
Do you think that is tomato?No ,that's kitchen timer with tomato shaper.woow,that's so cool,so nice...
Give it to your mum,friends as a nice present.
why not contact us: EMAIL:seremnty@gmail.com
Is not cool.......
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.
Go to Google Books Home
Patents
Application
Grant
Find prior art
Discuss this patent
View PDF
Download PDF
Patent US6506148 - Nervous system manipulation by electromagnetic fields from monitors
Publication number US6506148 B2
Publication type Grant
Application number US 09/872,528
Publication date Jan 14, 2003
Filing date Jun 1, 2001
Priority date Jun 1, 2001
Fee status Paid
Also published as US20020188164
Inventors Hendricus G. Loos
Original Assignee Hendricus G. Loos
Export Citation BiBTeX, EndNote, RefMan
Patent Citations (16), Non-Patent Citations (5), Referenced by (3), Classifications (6), Legal Events (3)
External Links: USPTO, USPTO Assignment, Espacenet
Nervous system manipulation by electromagnetic fields from monitors
US 6506148 B2
Abstract
Physiological effects have been observed in a human subject in response to stimulation of the skin with weak electromagnetic fields that are pulsed with certain frequencies near ½ Hz or 2.4 Hz, such as to excite a sensory resonance. Many computer monitors and TV tubes, when displaying pulsed images, emit pulsed electromagnetic fields of sufficient amplitudes to cause such excitation. It is therefore possible to manipulate the nervous system of a subject by pulsing images displayed on a nearby computer monitor or TV set. For the latter, the image pulsing may be imbedded in the program material, or it may be overlaid by modulating a video stream, either as an RF signal or as a video signal. The image displayed on a computer monitor may be pulsed effectively by a simple computer program. For certain monitors, pulsed electromagnetic fields capable of exciting sensory resonances in nearby subjects may be generated even as the displayed images are pulsed with subliminal intensity.
Images(10)
Patent Drawing
Patent Drawing
Patent Drawing
Patent Drawing
Patent Drawing
Patent Drawing
Patent Drawing
Patent Drawing
Patent Drawing
Patent Drawing
Previous page
Next page
Claims(14)
I claim:
1. A method for manipulating the nervous system of a subject located near a monitor, the monitor emitting an electromagnetic field when displaying an image by virtue of the physical display process, the subject having a sensory resonance frequency, the method comprising:
creating a video signal for displaying an image on the monitor, the image having an intensity;
modulating the video signal for pulsing the image intensity with a frequency in the range 0.1 Hz to 15 Hz; and
setting the pulse frequency to the resonance frequency.
2. A computer program for manipulating the nervous system of a subject located near a monitor, the monitor emitting an electromagnetic field when displaying an image by virtue of the physical display process, the subject having cutaneous nerves that fire spontaneously and have spiking patterns, the computer program comprising:
a display routine for displaying an image on the monitor, the image having an intensity;
a pulse routine for pulsing the image intensity with a frequency in the range 0.1 Hz to 15 Hz; and
a frequency routine that can be internally controlled by the subject, for setting the frequency;
whereby the emitted electromagnetic field is pulsed, the cutaneous nerves are exposed to the pulsed electromagnetic field, and the spiking patterns of the nerves acquire a frequency modulation.
3. The computer program of claim 2, wherein the pulsing has an amplitude and the program further comprises an amplitude routine for control of the amplitude by the subject.
4. The computer program of claim 2, wherein the pulse routine comprises:
a timing procedure for timing the pulsing; and
an extrapolation procedure for improving the accuracy of the timing procedure.
5. The computer program of claim 2, further comprising a variability routine for introducing variability in the pulsing.
6. Hardware means for manipulating the nervous system of a subject located near a monitor, the monitor being responsive to a video stream and emitting an electromagnetic field when displaying an image by virtue of the physical display process, the image having an intensity, the subject having cutaneous nerves that fire spontaneously and have spiking patterns, the hardware means comprising:
pulse generator for generating voltage pulses;
means, responsive to the voltage pulses, for modulating the video stream to pulse the image intensity;
whereby the emitted electromagnetic field is pulsed, the cutaneous nerves are exposed to the pulsed electromagnetic field, and the spiking patterns of the nerves acquire a frequency modulation.
7. The hardware means of claim 6, wherein the video stream is a composite video signal that has a pseudo-dc level, and the means for modulating the video stream comprise means for pulsing the pseudo-dc level.
8. The hardware means of claim 6, wherein the video stream is a television broadcast signal, and the means for modulating the video stream comprise means for frequency wobbling of the television broadcast signal.
9. The hardware means of claim 6, wherein the monitor has a brightness adjustment terminal, and the means for modulating the video stream comprise a connection from the pulse generator to the brightness adjustment terminal.
10. A source of video stream for manipulating the nervous system of a subject located near a monitor, the monitor emitting an electromagnetic field when displaying an image by virtue of the physical display process, the subject having cutaneous nerves that fire spontaneously and have spiking patterns, the source of video stream comprising:
means for defining an image on the monitor, the image having an intensity; and
means for subliminally pulsing the image intensity with a frequency in the range 0.1 Hz to 15 Hz;
whereby the emitted electromagnetic field is pulsed, the cutaneous nerves are exposed to the pulsed electromagnetic field, and the spiking patterns of the nerves acquire a frequency modulation.
11. The source of video stream of claim 10 wherein the source is a recording medium that has recorded data, and the means for subliminally pulsing the image intensity comprise an attribute of the recorded data.
12. The source of video stream of claim 10 wherein the source is a computer program, and the means for subliminally pulsing the image intensity comprise a pulse routine.
13. The source of video stream of claim 10 wherein the source is a recording of a physical scene, and the means for subliminally pulsing the image intensity comprise:
pulse generator for generating voltage pulses;
light source for illuminating the scene, the light source having a power level; and
modulation means, responsive to the voltage pulses, for pulsing the power level.
14. The source of video stream of claim 10, wherein the source is a DVD, the video stream comprises a luminance signal and a chrominance signal, and the means for subliminal pulsing of the image intensity comprise means for pulsing the luminance signal.
Description
BACKGROUND OF THE INVENTION
The invention relates to the stimulation of the human nervous system by an electromagnetic field applied externally to the body. A neurological effect of external electric fields has been mentioned by Wiener (1958), in a discussion of the bunching of brain waves through nonlinear interactions. The electric field was arranged to provide “a direct electrical driving of the brain”. Wiener describes the field as set up by a 10 Hz alternating voltage of 400 V applied in a room between ceiling and ground. Brennan (1992) describes in U.S. Pat. No. 5,169,380 an apparatus for alleviating disruptions in circadian rythms of a mammal, in which an alternating electric field is applied across the head of the subject by two electrodes placed a short distance from the skin.
A device involving a field electrode as well as a contact electrode is the “Graham Potentializer” mentioned by Hutchison (1991). This relaxation device uses motion, light and sound as well as an alternating electric field applied mainly to the head. The contact electrode is a metal bar in Ohmic contact with the bare feet of the subject, and the field electrode is a hemispherical metal headpiece placed several inches from the subject's head.
In these three electric stimulation methods the external electric field is applied predominantly to the head, so that electric currents are induced in the brain in the physical manner governed by electrodynamics. Such currents can be largely avoided by applying the field not to the head, but rather to skin areas away from the head. Certain cutaneous receptors may then be stimulated and they would provide a signal input into the brain along the natural pathways of afferent nerves. It has been found that, indeed, physiological effects can be induced in this manner by very weak electric fields, if they are pulsed with a frequency near ½ Hz. The observed effects include ptosis of the eyelids, relaxation, drowziness, the feeling of pressure at a centered spot on the lower edge of the brow, seeing moving patterns of dark purple and greenish yellow with the eyes closed, a tonic smile, a tense feeling in the stomach, sudden loose stool, and sexual excitement, depending on the precise frequency used, and the skin area to which the field is applied. The sharp frequency dependence suggests involvement of a resonance mechanism.
It has been found that the resonance can be excited not only by externally applied pulsed electric fields, as discussed in U.S. Pat. Nos. 5,782,874, 5,899,922, 6,081,744, and 6,167,304, but also by pulsed magnetic fields, as described in U.S. Pat. Nos. 5,935,054 and 6,238,333, by weak heat pulses applied to the skin, as discussed in U.S. Pat. Nos. 5,800,481 and 6,091,994, and by subliminal acoustic pulses, as described in U.S. Pat. No. 6,017,302. Since the resonance is excited through sensory pathways, it is called a sensory resonance. In addition to the resonance near ½ Hz, a sensory resonance has been found near 2.4 Hz. The latter is characterized by the slowing of certain cortical processes, as discussed in the '481, '922, '302, '744, '944, and '304 patents.
The excitation of sensory resonances through weak heat pulses applied to the skin provides a clue about what is going on neurologically. Cutaneous temperature-sensing receptors are known to fire spontaneously. These nerves spike somewhat randomly around an average rate that depends on skin temperature. Weak heat pulses delivered to the skin in periodic fashion will therefore cause a slight frequency modulation (fm) in the spike patterns generated by the nerves. Since stimulation through other sensory modalities results in similar physiological effects, it is believed that frequency modulation of spontaneous afferent neural spiking patterns occurs there as well.
It is instructive to apply this notion to the stimulation by weak electric field pulses administered to the skin. The externally generated fields induce electric current pulses in the underlying tissue, but the current density is much too small for firing an otherwise quiescent nerve. However, in experiments with adapting stretch receptors of the crayfish, Terzuolo and Bullock (1956) have observed that very small electric fields can suffice for modulating the firing of already active nerves. Such a modulation may occur in the electric field stimulation under discussion.
Further understanding may be gained by considering the electric charges that accumulate on the skin as a result of the induced tissue currents. Ignoring thermodynamics, one would expect the accumulated polarization charges to be confined strictly to the outer surface of the skin. But charge density is caused by a slight excess in positive or negative ions, and thermal motion distributes the ions through a thin layer. This implies that the externally applied electric field actually penetrates a short distance into the tissue, instead of stopping abruptly at the outer skin surface. In this manner a considerable fraction of the applied field may be brought to bear on some cutaneous nerve endings, so that a slight modulation of the type noted by Terzuolo and Bullock may indeed occur.
The mentioned physiological effects are observed only when the strength of the electric field on the skin lies in a certain range, called the effective intensity window. There also is a bulk effect, in that weaker fields suffice when the field is applied to a larger skin area. These effects are discussed in detail in the '922 patent.
Since the spontaneous spiking of the nerves is rather random and the frequency modulation induced by the pulsed field is very shallow, the signal to noise ratio (S/N) for the fm signal contained in the spike trains along the afferent nerves is so small as to make recovery of the fm signal from a single nerve fiber impossibile. But application of the field over a large skin area causes simultaneous stimulation of many cutaneous nerves, and the fm modulation is then coherent from nerve to nerve. Therefore, if the afferent signals are somehow summed in the brain, the fm modulations add while the spikes from different nerves mix and interlace. In this manner the S/N can be increased by appropriate neural processing. The matter is discussed in detail in the '874 patent. Another increase in sensitivity is due to involving a resonance mechanism, wherein considerable neural circuit oscillations can result from weak excitations.
An easily detectable physiological effect of an excited ½ Hz sensory resonance is ptosis of the eyelids. As discussed in the '922 patent, the ptosis test involves first closing the eyes about half way. Holding this eyelid position, the eyes are rolled upward, while giving up voluntary control of the eyelids. The eyelid position is then determined by the state of the autonomic nervous system. Furthermore, the pressure excerted on the eyeballs by the partially closed eyelids increases parasympathetic activity. The eyelid position thereby becomes somewhat labile, as manifested by a slight flutter. The labile state is sensitive to very small shifts in autonomic state. The ptosis influences the extent to which the pupil is hooded by the eyelid, and thus how much light is admitted to the eye. Hence, the depth of the ptosis is seen by the subject, and can be graded on a scale from 0 to 10.
In the initial stages of the excitation of the ½ Hz sensory resonance, a downward drift is detected in the ptosis frequency, defined as the stimulation frequency for which maximum ptosis is obtained. This drift is believed to be caused by changes in the chemical milieu of the resonating neural circuits. It is thought that the resonance causes perturbations of chemical concentrations somewhere in the brain, and that these perturbations spread by diffusion to nearby resonating circuits. This effect, called “chemical detuning”, can be so strong that ptosis is lost altogether when the stimulation frequency is kept constant in the initial stages of the excitation. Since the stimulation then falls somewhat out of tune, the resonance decreases in amplitude and chemical detuning eventually diminishes. This causes the ptosis frequency to shift back up, so that the stimulation is more in tune and the ptosis can develop again. As a result, for fixed stimulation frequencies in a certain range, the ptosis slowly cycles with a frequency of several minutes. The matter is discussed in the '302 patent.
The stimulation frequencies at which specific physiological effects occur depend somewhat on the autonomic nervous system state, and probably on the endocrine state as well.
Weak magnetic fields that are pulsed with a sensory resonance frequency can induce the same physiological effects as pulsed electric fields. Unlike the latter however, the magnetic fields penetrate biological tissue with nearly undiminished strength. Eddy currents in the tissue drive electric charges to the skin, where the charge distributions are subject to thermal smearing in much the same way as in electric field stimulation, so that the same physiological effects develop. Details are discussed in the '054 patent.
SUMMARY
Computer monotors and TV monitors can be made to emit weak low-frequency electromagnetic fields merely by pulsing the intensity of displayed images. Experiments have shown that the ½ Hz sensory resonance can be excited in this manner in a subject near the monitor. The 2.4 Hz sensory resonance can also be excited in this fashion. Hence, a TV monitor or computer monitor can be used to manipulate the nervous system of nearby people.
The implementations of the invention are adapted to the source of video stream that drives the monitor, be it a computer program, a TV broadcast, a video tape or a digital video disc (DVD).
For a computer monitor, the image pulses can be produced by a suitable computer program. The pulse frequency may be controlled through keyboard input, so that the subject can tune to an individual sensory resonance frequency. The pulse amplitude can be controlled as well in this manner. A program written in Visual Basic(R) is particularly suitable for use on computers that run the Windows 95(R) or Windows 98(R) operating system. The structure of such a program is described. Production of periodic pulses requires an accurate timing procedure. Such a procedure is constructed from the GetTimeCount function available in the Application Program Interface (API) of the Windows operating system, together with an extrapolation procedure that improves the timing accuracy.
Pulse variability can be introduced through software, for the purpose of thwarting habituation of the nervous system to the field stimulation, or when the precise resonance frequency is not known. The variability may be a pseudo-random variation within a narrow interval, or it can take the form of a frequency or amplitude sweep in time. The pulse variability may be under control of the subject.
The program that causes a monitor to display a pulsing image may be run on a remote computer that is connected to the user computer by a link; the latter may partly belong to a network, which may be the Internet.
For a TV monitor, the image pulsing may be inherent in the video stream as it flows from the video source, or else the stream may be modulated such as to overlay the pulsing. In the first case, a live TV broadcast can be arranged to have the feature imbedded simply by slightly pulsing the illumination of the scene that is being broadcast. This method can of course also be used in making movies and recording video tapes and DVDs.
Video tapes can be edited such as to overlay the pulsing by means of modulating hardware. A simple modulator is discussed wherein the luminance signal of composite video is pulsed without affecting the chroma signal. The same effect may be introduced at the consumer end, by modulating the video stream that is produced by the video source. A DVD can be edited through software, by introducing pulse-like variations in the digital RGB signals. Image intensity pulses can be overlaid onto the analog component video output of a DVD player by modulating the luminance signal component. Before entering the TV set, a television signal can be modulated such as to cause pulsing of the image intensity by means of a variable delay line that is connected to a pulse generator.
Certain monitors can emit electromagnetic field pulses that excite a sensory resonance in a nearby subject, through image pulses that are so weak as to be subliminal. This is unfortunate since it opens a way for mischievous application of the invention, whereby people are exposed unknowingly to manipulation of their nervous systems for someone else's purposes. Such application would be unethical and is of course not advocated. It is mentioned here in order to alert the public to the possibility of covert abuse that may occur while being online, or while watching TV, a video, or a DVD.
DESCRIPTION OF THE DRAWINGS
FIG. 1 illustrates the electromagnetic field that emanates from a monitor when the video signal is modulated such as to cause pulses in image intensity, and a nearby subject who is exposed to the field.
FIG. 2 shows a circuit for modulation of a composite video signal for the purpose of pulsing the image intensity.
FIG. 3 shows the circuit for a simple pulse generator.
FIG. 4 illustrates how a pulsed electromagnetic field can be generated with a computer monitor.
FIG. 5 shows a pulsed electromagnetic field that is generated by a television set through modulation of the RF signal input to the TV.
FIG. 6 outlines the structure of a computer program for producing a pulsed image.
FIG. 7 shows an extrapolation procedure introduced for improving timing accuracy of the program of FIG. 6.
FIG. 8 illustrates the action of the extrapolation procedure of FIG. 7.
FIG. 9 shows a subject exposed to a pulsed electromagnetic field emanating from a monitor which is responsive to a program running on a remote computer via a link that involves the Internet.
FIG. 10 shows the block diagram of a circuit for frequency wobbling of a TV signal for the purpose of pulsing the intensity of the image displayed on a TV monitor.
FIG. 11 depicts schematically a recording medium in the form of a video tape with recorded data, and the attribute of the signal that causes the intensity of the displayed image to be pulsed.
FIG. 12 illustrates how image pulsing can be embedded in a video signal by pulsing the illumination of the scene that is being recorded.
FIG. 13 shows a routine that introduces pulse variability into the computer program of FIG. 6.
FIG. 14 shows schematically how a CRT emits an electromagnetic field when the displayed image is pulsed.
FIG. 15 shows how the intensity of the image displayed on a monitor can be pulsed through the brightness control terminal of the monitor.
FIG. 16 illustrates the action of the polarization disc that serves as a model for grounded conductors in the back of a CRT screen.
FIG. 17 shows the circuit for overlaying image intensity pulses on a DVD output.
FIG. 18 shows measured data for pulsed electric fields emitted by two different CRT type monitors, and a comparison with theory.
DETAILED DESCRIPTION
Computer monitors and TV monitors emit electromagnetic fields. Part of the emission occurs at the low frequencies at which displayed images are changing. For instance, a rythmic pulsing of the intensity of an image causes electromagnetic field emission at the pulse frequency, with a strength proportional to the pulse amplitude. The field is briefly referred to as “screen emission”. In discussing this effect, any part or all what is displayed on the monitor screen is called an image. A monitor of the cathode ray tube (CRT) type has three electron beams, one for each of the basic colors red, green, and blue. The intensity of an image is here defined as
I=∫j dA, (1)
where the integral extends over the image, and
j=jr+jg+jb, (2)
jr, jg, and jb being the electric current densities in the red, green, and blue electron beams at the surface area dA of the image on the screen. The current densities are to be taken in the distributed electron beam model, where the discreteness of pixels and the raster motion of the beams are ignored, and the back of the monitor screen is thought to be irradiated by diffuse electron beams. The beam current densities are then functions of the coordinates x and y over the screen. The model is appropriate since we are interested in the electromagnetic field emision caused by image pulsing with the very low frequencies of sensory resonances, whereas the emissions with the much higher horizontal and vertical sweep frequencies are of no concern. For a CRT the intensity of an image is expressed in millamperes.
For a liquid crystal display (LCD), the current densities in the definition of image intensity are to be replaced by driving voltages, multiplied by the aperture ratio of the device. For an LCD, image intensities are thus expressed in volts.
It will be shown that for a CRT or LCD screen emissions are caused by fluctuations in image intensity. In composite video however, intensity as defined above is not a primary signal feature, but luminance Y is. For any pixel one has
Y=0.299R+0.587G+0.114B, (3)
where R, G, and B are the intensities of the pixel respectively in red, green and blue, normalized such as to range from 0 to 1. The definition (3) was provided by the Commission Internationale de l'Eclairage (CIE), in order to account for brightness differences at different colors, as perceived by the human visual system. In composite video the hue of the pixel is determined by the chroma signal or chrominance, which has the components R-Y and B-Y It follows that pulsing pixel luminance while keeping the hue fixed is equivalent to pulsing the pixel intensity, up to an amplitude factor. This fact will be relied upon when modulating a video stream such as to overlay image intensity pulses.
It turns out that the screen emission has a multipole expansion wherein both monopole and dipole contributions are proportional to the rate of change of the intensity I of (1). The higher order multipole contributions are proportional to the rate of change of moments of the current density j over the image, but since these contributions fall off rapidly with distance, they are not of practical importance in the present context. Pulsing the intensity of an image may involve different pulse amplitudes, frequencies, or phases for different parts of the image. Any or all of these features may be under subject control.
The question arises whether the screen emission can be strong enough to excite sensory resonances in people located at normal viewing distances from the monitor. This turns out to be the case, as shown by sensory resonance experiments and independently by measuring the strength of the emitted electric field pulses and comparing the results with the effective intensity window as explored in earlier work.
One-half Hertz sensory resonance experiments have been conducted with the subject positioned at least at normal viewing distance from a 15″ computer monitor that was driven by a computer program written in Visual Basic(R), version 6.0 (VB6). The program produces a pulsed image with uniform luminance and hue over the full screen, except for a few small control buttons and text boxes. In VB6, screen pixel colors are determined by integers R, G, and B, that range from 0 to 255, and set the contributions to the pixel color made by the basic colors red, green, and blue. For a CRT-type monitor, the pixel intensities for the primary colors may depend on the RGB values in a nonlinear manner that will be discussed. In the VB6 program the RGB values are modulated by small pulses ΔR, ΔG, ΔB, with a frequency that can be chosen by the subject or is swept in a predetermined manner. In the sensory resonance experiments mentioned above, the ratios ΔR/R, ΔG/G, and ΔB/B were always smaller than 0.02, so that the image pulses are quite weak. For certain frequencies near ½ Hz, the subject experienced physiological effects that are known to accompany the excitation of the ½ Hz sensory resonance as mentioned in the Background Section. Moreover, the measured field pulse amplitudes fall within the effective intensity window for the ½ Hz resonance, as explored in earlier experiments and discussed in the '874, '744, '922, and '304 patents. Other experiments have shown that the 2.4 Hz sensory resonance can be exited as well by screen emissions from monitors that display pulsed images.
These results confirm that, indeed, the nervous system of a subject can be manipulated through electromagnetic field pulses emitted by a nearby CRT or LCD monitor which displays images with pulsed intensity.
The various implementations of the invention are adapted to the different sources of video stream, such as video tape, DVD, a computer program, or a TV broadcast through free space or cable. In all of these implementations, the subject is exposed to the pulsed electromagnetic field that is generated by the monitor as the result of image intensity pulsing. Certain cutaneous nerves of the subject exhibit spontaneous spiking in patterns which, although rather random, contain sensory information at least in the form of average frequency. Some of these nerves have receptors that respond to the field stimulation by changing their average spiking frequency, so that the spiking patterns of these nerves acquire a frequency modulation, which is conveyed to the brain. The modulation can be particularly effective if it has a frequency at or near a sensory resonance frequency. Such frequencies are expected to lie in the range from 0.1 to 15 Hz.
An embodiment of the invention adapted to a VCR is shown in FIG. 1, where a subject 4 is exposed to a pulsed electric field 3 and a pulsed magnetic field 39 that are emitted by a monitor 2, labeled “MON”, as the result of pulsing the intensity of the displayed image. The image is here generated by a video casette recorder 1, labeled “VCR”, and the pulsing of the image intensity is obtained by modulating the composite video signal from the VCR output. This is done by a video modulator 5, labeled “VM”, which responds to the signal from the pulse generator 6, labeled “GEN”. The frequency and amplitude of the image pulses can be adjusted with the frequency control 7 and amplitude control 8. Frequency and amplitude adjustments can be made by the subject.
The circuit of the video modulator 5 of FIG. 1 is shown in FIG. 2, where the video amplifiers 11 and 12 process the composite video signal that enters at the input terminal 13. The level of the video signal is modulated slowly by injecting a small bias current at the inverting input 17 of the first amplifier 11. This current is caused by voltage pulses supplied at the modulation input 16, and can be adjusted through the potentiometer 15. Since the noninverting input of the amplifier is grounded, the inverting input 17 is kept essentially at ground potential, so that the bias current is is not influenced by the video signal. The inversion of the signal by the first amplifier 11 is undone by the second amplifier 12. The gains of the amplifiers are chosen such as to give a unity overall gain. A slowly varying current injected at the inverting input 17 causes a slow shift in the “pseudo-dc” level of the composite video signal, here defined as the short-term average of the signal. Since the pseudo-dc level of the chroma signal section determines the luminance, the latter is modulated by the injected current pulses. The chroma signal is not affected by the slow modulation of the pseudodc level, since that signal is determined by the amplitude and phase with respect to the color carrier which is locked to the color burst. The effect on the sync pulses and color bursts is of no consequence either if the injected current pulses are very small, as they are in practice. The modulated composite video signal, available at the output 14 in FIG. 2, will thus exhibit a modulated luminance, whereas the chroma signal is unchanged. In the light of the foregoing discussion about luminance and intensity, it follows that the modulator of FIG. 2 causes a pulsing of the image intensity I. It remains to give an example how the pulse signal at the modulation input 16 may be obtained. FIG. 3 shows a pulse generator that is suitable for this purpose, wherein the RC timer 21 (Intersil ICM7555) is hooked up for astable operation and produces a square wave voltage with a frequency that is determined by capacitor 22 and potentiometer 23. The timer 21 is powered by a battery 26, controlled by the switch 27. The square wave voltage at output 25 drives the LED 24, which may be used for monitoring of the pulse frequency, and also serves as power indicator. The pulse output may be rounded in ways that are well known in the art. In the setup of FIG. 1, the output of VCR 1 is connected to the video input 13 of FIG. 2, and the video output 14 is connected to the monitor 2 of FIG. 1.
In the preferred embodiment of the invention, the image intensity pulsing is caused by a computer program. As shown in FIG. 4, monitor 2, labeled “MON”, is connected to computer 31 labeled “COMPUTER”, which runs a program that produces an image on the monitor and causes the image intensity to be pulsed. The subject 4 can provide input to the computer through the keyboard 32 that is connected to the computer by the connection 33. This input may involve adjustments of the frequency or the amplitude or the variability of the image intensity pulses. In particular, the pulse frequency can be set to a sensory resonance frequency of the subject for the purpose of exciting the resonance.
The structure of a computer program for pulsing image intensity is shown in FIG. 6. The program may be written in Visual Basic(R) version 6.0 (VB6), which involves the graphics interface familiar from the Windows(R) operating system. The images appear as forms equipped with user controls such as command buttons and scroll bars, together with data displays such as text boxes. A compiled VB6 program is an executable file. When activated, the program declares variables and functions to be called from a dynamic link library (DLL) that is attached to the operating system; an initial form load is performed as well. The latter comprises setting the screen color as specified by integers R, G, and B in the range 0 to 255, as mentioned above. In FIG. 6, the initial setting of the screen color is labeled as 50. Another action of the form load routine is the computation 51 of the sine function at eight equally spaced points, I=0 to 7, around the unit circle. These values are needed when modulating the RGB numbers. Unfortunately, the sine function is distorted by the rounding to integer RGB values that occurs in the VB6 program. The image is chosen to fill as much of the screen area as possible, and it has spatially uniform luminance and hue.
The form appearing on the monitor displays a command button for starting and stopping the image pulsing, together with scroll bars 52 and 53 respectively for adjustment of the pulse frequency F and the pulse amplitude A. These pulses could be initiated by a system timer which is activated upon the elapse of a preset time interval. However, timers in VB6 are too inaccurate for the purpose of providing the eight RGB adjustment points in each pulse cycle. An improvement can be obtained by using the GetTickCount function that is available in the Application Program Interface (API) of Windows 95(R) and Windows 98(R). The GetTickCount function returns the system time that has elapsed since starting Windows, expressed in milliseconds. User activation of the start button 54 provides a tick count TN through request 55 and sets the timer interval to TT miliseconds, in step 56. TT was previously calculated in the frequency routine that is activated by changing the frequency, denoted as step 52.
Since VB6 is an event-driven program, the flow chart for the program falls into disjoint pieces. Upon setting the timer interval to TT in step 56, the timer runs in the background while the program may execute subroutines such as adjustment of pulse frequency or amplitude. Upon elapse of the timer interval TT, the timer subroutine 57 starts execution with request 58 for a tick count, and in 59 an upgrade is computed of the time TN for the next point at which the RGB values are to be adjusted. In step 59 the timer is turned off, to be reactivated later in step 67. Step 59 also resets the parameter CR which plays a role in the extrapolation procedure 61 and the condition 60. For ease of understanding at this point, it is best to pretend that the action of 61 is simply to get a tick count, and to consider the loop controled by condition 60 while keeping CR equal to zero. The loop would terminate when the tick count M reaches or exceeds the time TN for the next phase point, at which time the program should adjust the image intensity through steps 63-65. For now step 62 is to be ignored also, since it has to do with the actual extrapolation procedure 61. The increments to the screen colors R1, G1, and B1 at the new phase point are computed according to the sine function, applied with the amplitude A that was set by the user in step 53. The number I that labels the phase point is incremented by unity in step 65, but if this results in I=8 the value is reset to zero in 66. Finally, the timer is reactivated in step 67, initiating a new ⅛-cycle step in the periodic progression of RGB adjustments.
A program written in this way would exhibit a large jitter in the times at which the RGB values are changed. This is due to the lumpiness in the tick counts returned by the GetTickCount function. The lumpiness may be studied separately by running a simple loop with C=GetTickCount, followed by writing the result C to a file. Inspection shows that C has jumped every 14 or 15 milliseconds, between long stretches of constant values. Since for a ½ Hz image intensity modulation the ⅛-cycle phase points are 250 ms apart, the lumpiness of 14 or 15 ms in the tick count would cause considerable inaccuracy. The full extrapolation procedure 61 is introduced in order to diminish the jitter to acceptable levels. The procedure works by refining the heavy-line staircase function shown in FIG. 8, using the slope RR of a recent staircase step to accurately determine the loop count 89 at which the loop controled by 60 needs to be exited. Details of the extrapolation procedure are shown in FIG. 7 and illustrated in FIG. 8. The procedure starts at 70 with both flags off, and CR=0, because of the assignment in 59 or 62 in FIG. 6. A tick count M is obtained at 71, and the remaining time MR to the next phase point is computed in 72. Conditions 77 and 73 are not satisfied and therefore passed vertically in the flow chart, so that only the delay block 74 and the assignments 75 are executed. Condition 60 of FIG. 6 is checked and found to be satisfied, so that the extrapolation procedure is reentered. The process is repeated until the condition 73 is met when the remaining time MR jumps down through the 15 ms level, shown in FIG. 8 as the transition 83. The condition 73 then directs the logic flow to the assignments 76, in which the number DM labeled by 83 is computed, and FLG1 is set. The computation of DM is required for finding the slope RR of the straight-line element 85. One also needs the “Final LM” 86, which is the number of loops traversed from step 83 to the next downward step 84, here shown to cross the MR=0 axis. The final LM is determined after repeatedly incrementing LM through the side loop entered from the FLG1=1 condition 77, which is now satisfied since FLG1 was set in step 76. At the transition 84 the condition 78 is met, so that the assignments 79 are executed. This includes computation of the slope RR of the line element 85, setting FLG2, and resetting FLG1. From here on, the extrapolation procedure increments CR in steps of RR while skipping tick counts until condition 60 of FIG. 6 is violated, the loop is exited, and the RGB values are adjusted.
A delay block 74 is used in order to stretch the time required for traversing the extrapolation procedure. The block can be any computation intensive subroutine such as repeated calculations of tangent and arc tangent functions.
As shown in step 56 of FIG. 6, the timer interval TT is set to 4/10 of the time TA from one RGB adjustment point to the next. Since the timer runs in the background, this arrangement provides an opportunity for execution of other processes such as user adjustment of frequency or amplitude of the pulses.
The adjustment of the frequency and other pulse parameters of the image intensity modulation can be made internally, i.e., within the running program. Such internal control is to be distinguished from the external control provided, for instance, in screen savers. In the latter, the frequency of animation can be modified by the user, but only after having exited the screen saver program. Specifically, in Windows 95(R) or Windows 98(R), to change the animation frequency requires stopping the screen saver execution by moving the mouse, whereafter the frequency may be adjusted through the control panel. The requirement that the control be internal sets the present program apart from so-called banners as well.
The program may be run on a remote computer that is linked to the user computer, as illustrated in FIG. 9. Although the monitor 2, labeled “MON”, is connected to the computer 31′, labeled “COMPUTER”, the program that pulses the images on the monitor 2 runs on the remoter computer 90, labeled “REMOTE COMPUTER”, which is connected to computer 31′ through a link 91 which may in part belong to a network. The network may comprise the Internet 92.
The monitor of a television set emits an electromagnetic field in much the same way as a computer monitor. Hence, a TV may be used to produce screen emissions for the purpose of nervous system manipulation. FIG. 5 shows such an arrangement, where the pulsing of the image intensity is achieved by inducing a small slowly pulsing shift in the frequency of the RF signal that enters from the antenna. This process is here called “frequency wobbling” of the RF signal. In FM TV, a slight slow frequency wobble of the RF signal produces a pseudo-dc signal level fluctuation in the composite video signal, which in turn causes a slight intensity fluctuation of the image displayed on the monitor in the same manner as discussed above for the modulator of FIG. 2. The frequency wobbling is induced by the wobbler 44 of FIG. 5 labeled “RFM”, which is placed in the antenna line 43. The wobbler is driven by the pulse generator 6, labeled “GEN”. The subject can adjust the frequency and the amplitude of the wobble through the tuning control 7 and the amplitude control 41. FIG. 10 shows a block diagram of the frequency wobbler circuit that employs a variable delay line 94, labelled “VDL”. The delay is determined by the signal from pulse generator 6, labelled “GEN”. The frequency of the pulses can be adjusted with the tuning control 7. The amplitude of the pulses is determined by the unit 98, labelled “MD”, and can be adjusted with the amplitude control 41. Optionally, the input to the delay line may be routed through a preprocessor 93, labelled “PRP”, which may comprise a selective RF amplifier and down converter; a complimentary up conversion should then be performed on the delay line output by a postprocessor 95, labelled “POP”. The output 97 is to be connected to the antenna terminal of the TV set.
The action of the variable delay line 94 may be understood as follows. Let periodic pulses with period L be presented at the input. For a fixed delay the pulses would emerge at the output with the same period L. Actually, the time delay T is varied slowly, so that it increases approximately by LdT/dt between the emergence of consecutive pulses at the device output. The pulse period is thus increased approximately by
ΔL=LdT/dt. (4)
In terms of the frequency ∫, Eq. (4) implies approximately
Δ∫/∫=−dT/dt. (5)
For sinusoidal delay T(t) with amplitude b and frequency g, one has
Δ∫/∫=−2πgb cos (2πgt), (6)
which shows the frequency wobbling. The approximation is good for gb<<1, which is satisfied in practice. The relative frequency shift amplitude 2πgb that is required for effective image intensity pulses is very small compared to unity. For a pulse frequency g of the order of 1 Hz, the delay may have to be of the order of a millisecond. To accomodate such long delay values, the delay line may have to be implemented as a digital device. To do so is well within the present art. In that case it is natural to also choose digital implementations for the pulse generator 6 and the pulse amplitude controller 98, either as hardware or as software.
Pulse variability may be introduced for alleviating the need for precise tuning to a resonance frequency. This may be important when sensory resonance frequencies are not precisely known, because of the variation among individuals, or in order to cope with the frequency drift that results from chemical detuning that is discussed in the '874 patent. A field with suitably chosen pulse variability can then be more effective than a fixed frequency field that is out of tune. One may also control tremors and seizures, by interfering with the pathological oscillatory activity of neural circuits that occurs in these disorders. Electromagnetic fields with a pulse variability that results in a narrow spectrum of frequencies around the frequency of the pathological oscillatory activity may then evoke nerve signals that cause phase shifts which diminish or quench the oscillatory activity.
Pulse variability can be introduced as hardware in the manner described in the '304 patent. The variability may also be introduced in the computer program of FIG. 6, by setting FLG3 in step 68, and choosing the amplitude B of the frequency fluctuation. In the variability routine 46, shown in some detail in FIG. 13, FLG3 is detected in step 47, whereupon in steps 48 and 49 the pulse frequency F is modified pseudo randomly by a term proportional to B, every 4th cycle. Optionally, the amplitude of the image intensity pulsing may be modified as well, in similar fashion. Alternatively, the frequency and amplitude may be swept through an adjustable ramp, or according to any suitable schedule, in a manner known to those skilled in the art. The pulse variability may be applied to subliminal image intensity pulses.
When an image is displayed by a TV monitor in response to a TV broadcast, intensity pulses of the image may simply be imbedded in the program material. If the source of video signal is a recording medium, the means for pulsing the image intensity may comprise an attribute of recorded data. The pulsing may be subliminal. For the case of a video signal from a VCR, the pertinent data attribute is illustrated in FIG. 11, which shows a video signal record on part of a video tape 28. Depicted schematically are segments of the video signal in intervals belonging to lines in three image frames at different places along the tape. In each segment, the chroma signal 9 is shown, with its short-term average level 29 represented as a dashed line. The short-term average signal level, also called the pseudo-dc level, represents the luminance of the image pixels. Over each segment, the level is here constant because the image is for simplicity chosen as having a uniform luminance over the screen. However, the level is seen to vary from frame to frame, illustrating a luminance that pulses slowly over time. This is shown in the lower portion of the drawing, wherein the IRE level of the short-term chroma signal average is plotted versus time. The graph further shows a gradual decrease of pulse amplitude in time, illustrating that luminance pulse amplitude variations may also be an attribute of the recorded data on the video tape. As discussed, pulsing the luminance for fixed chrominance results in pulsing of the image intensity.
Data stream attributes that represent image intensity pulses on video tape or in TV signals may be created when producing a video rendition or making a moving picture of a scene, simply by pulsing the illumination of the scene. This is illustrated in FIG. 12, which shows a scene 19 that is recorded with a video camera 18, labelled “VR”. The scene is illuminated with a lamp 20, labelled “LAMP”, energized by an electric current through a cable 36. The current is modulated in pulsing fashion by a modulator 30, labeled “MOD”, which is driven by a pulse generator 6, labelled “GENERATOR”, that produces voltage pulses 35. Again, pulsing the luminance but not the chrominance amounts to pulsing the image intensity.
The brightness of monitors can usually be adjusted by a control, which may be addressable through a brightness adjustment terminal. If the control is of the analog type, the displayed image intensity may be pulsed as shown in FIG. 15, simply by a pulse generator 6, labeled “GEN”, that is connected to the brigthness adjustment terminal 88 of the monitor 2, labeled “MON”. Equivalent action can be provided for digital brightness controls, in ways that are well known in the art.
The analog component video signal from a DVD player may be modulated such as to overlay image intensity pulses in the manner illustrated in FIG. 17. Shown are a DVD player 102, labeled “DVD”, with analog component video output comprised of the luminance Y and chrominance C. The overlay is accomplished simply by shifting the luminance with a voltage pulse from generator 6, labeled “GENERATOR”. The generator output is applied to modulator 106, labeled “SHIFTER”. Since the luminance Y is pulsed without changing the chrominance C, the image intensity is pulsed. The frequency and amplitude of the image intensity pulses can be adjusted respectively with the tuner 7 and amplitude control 107. The modulator 105 has the same structure as the modulator of FIG. 2, and the pulse amplitude control 107 operates the potentiometer 15 of FIG. 2. The same procedure can be followed for editing a DVD such as to overlay image intensity pulses, by processing the modulated luminance signal through an analog-to-digital converter, and recording the resulting digital stream onto a DVD, after appropriate compression. Alternatively, the digital luminance data can be edited by electronic reading of the signal, decompression, altering the digital data by software, and recording the resulting digital signal after proper compression, all in a manner that is well known in the art.
The mechanism whereby a CRT-type monitor emits a pulsed electromagnetic field when pulsing the intensity of an image is illustrated in FIG. 14. The image is produced by an electron beam 10 which impinges upon the backside 88 of the screen, where the collisions excite phosphors that subsequently emit light. In the process, the electron beam deposits electrons 18 on the screen, and these electrons contribute to an electric field 3 labelled “E”. The electrons flow along the conductive backside 88 of the screen to the terminal 99 which is hooked up to the high-voltage supply 40, labelled “HV”. The circuit is completed by the ground connection of the supply, the video amplifier 87, labeled “VA”, and its connection to the cathodes of the CRT. The electron beams of the three electron guns are collectively shown as 10, and together the beams carry a current J. The electric current J flowing through the described circuit induces a magnetic field 39, labeled “B”. Actually, there are a multitude of circuits along which the electron beam current is returned to the CRT cathodes, since on a macroscopic scale the conductive back surface 88 of the screen provides a continuum of paths from the beam impact point to the high-voltage terminal 99. The magnetic fields induced by the currents along these paths partially cancel each other, and the resulting field depends on the location of the pixel that is addressed. Since the beams sweep over the screen through a raster of horizontal lines, the spectrum of the induced magnetic field contains strong peaks at the horizontal and vertical frequencies. However, the interest here is not in fields at those frequencies, but rather in emissions that result from an image pulsing with the very low frequencies appropriate to sensory resonances. For this purpose a diffuse electron current model suffices, in which the pixel discreteness and the raster motion of the electron beams are ignored, so that the beam current becomes diffuse and fills the cone subtended by the displayed image. The resulting low-frequency magnetic field depends on the temporal changes in the intensity distribution over the displayed image. Order-of-magnitude estimates show that the low-frequency magnetic field, although quite small, may be sufficient for the excitation of sensory resonances in subjects located at a normal viewing distance from the monitor.
The monitor also emits a low-frequency electric field at the image pulsing frequency. This field is due in part to the electrons 18 that are deposited on the screen by the electron beams 10. In the diffuse electron beam model, screen conditions are considered functions of the time t and of the Cartesian coordinates x and y over a flat CRT screen.
The screen electrons 18 that are dumped onto the back of the screen by the sum j(x,y,t) of the diffuse current distributions in the red, green, and blue electron beams cause a potential distribution V(x,y,t) which is influenced by the surface conductivity σ on the back of the screen and by capacitances. In the simple model where the screen has a capacitance distribution c(x,y) to ground and mutual capacitances between parts of the screen at different potentials are neglected, a potential distribution V(x,y,t) over the screen implies a surface charge density distribution
q=Vc(x,y), (7)
and gives rise to a current density vector along the screen,
j s=−σgrads V, (8)
where grads is the gradient along the screen surface. Conservation of electric charge implies
j=c{dot over (V)}−div s (σgrad s V), (9)
where the dot over the voltage denotes the time derivative, and divs is the divergence in the screen surface. The partial differential equation (9) requires a boundary condition for the solution V(x,y,t) to be unique. Such a condition is provided by setting the potential at the rim of the screen equal to the fixed anode voltage. This is a good approximation, since the resistance Rr between the screen rim and the anode terminal is chosen small in CRT design, in order to keep the voltage loss JRr to a minimum, and also to limit low-frequency emissions.
Something useful can be learned from special cases with simple solutions. As such, consider a circular CRT screen of radius R with uniform conductivity, showered in the back by a diffuse electron beam with a spatially uniform beam current density that is a constant plus a sinusoidal part with frequency ∫. Since the problem is linear, the voltage V due to the sinusoidal part of the beam current can be considered separately, with the boundary condition that V vanish at the rim of the circular screen. Eq. (9) then simplifies to
V″+V″/r−i2π∫cn V=−Jη/A, r≦R, (10)
where r is a radial coordinate along the screen with its derivative denoted by a prime, η=1/σ is the screen resistivity, A the screen area, J the sinusoidal part of the total beam current, and i=(−1), the imaginary unit. Our interest is in very low pulse frequencies ∫ that are suitable for excitation of sensory resonances. For those frequencies and for practical ranges for c and η, the dimensionless number 2π∫cAη is very much smaller than unity, so that it can be neglected in Eq. (10). The boundary value problem then has the simple solution V ( r ) = J η 4 π ( 1 - ( r / R ) 2 ) . ( 11 )
Figure US06506148-20030114-M00001
In deriving (11) we neglected the mutual capacitance between parts of the screen that are at different potentials. The resulting error in (10) is negligible for the same reason that the i2π∫cAη term in (10) can be neglected.
The potential distribution V(r) of (11) along the screen is of course accompanied by electric charges. The field lines emanating from these charges run mainly to conductors behind the screen that belong to the CRT structure and that are either grounded or connected to circuitry with a low impedance path to ground. In either case the mentioned conductors must be considered grounded in the analysis of charges and fields that result from the pulsed component J of the total electron beam current. The described electric field lines end up in electric charges that may be called polarization charges since they are the result of the polarization of the conductors and circuitry by the screen emission. To estimate the pulsed electric field, a model is chosen where the mentioned conductors are represented together as a grounded perfectly conductive disc of radius R, positioned a short distance δ behind the screen, as depicted in FIG. 16. Since the grounded conductive disc carries polarization charges, it is called the polarization disc. FIG. 16 shows the circular CRT screen 88 and the polarization disc 101, briefly called “plates”. For small distances δ, the capacitance density between the plates of opposite polarity is nearly equal to ε/δ, where ε is the permittivity of free space. The charge distributions on the screen and polarization disc are respectively εV(r)/δ+q0 and −εV(r)/δ+q0, where the εV(r)/δ terms denote opposing charge densities at the end of the dense field lines that run between the two plates. That the part q0 is needed as well will become clear in the sequel.
The charge distributions εV(r)/δ+q0 and −εV(r)/δ+q0 on the two plates have a dipole moment with the density D ( r ) = εV ( r ) = J ηε 4 π ( 1 - ( r / R ) 2 ) , ( 12 )
Figure US06506148-20030114-M00002
directed perpendicular to the screen. Note that the plate separation δ has dropped out. This means that the precise location of the polarization charges is not critical in the present model, and further that δ may be taken as small as desired. Taking δ to zero, one thus arrives at the mathematical model of pulsed dipoles distributed over the circular CRT screen. The field due to the charge distribution q0 will be calculated later.
The electric field induced by the distributed dipoles (12) can be calculated easily for points on the centerline of the screen, with the result E ( z ) = V ( 0 ) R { 2 ρ / R - R / ρ - 2 z / R } , ( 13 )
Figure US06506148-20030114-M00003
where V(0) is the pulse voltage (11) at the screen center, ρ the distance to the rim of the screen, and z the distance to the center of the screen. Note that V(0) pulses harmonically with frequency ∫, because in (11) the sinusoidal part J of the beam current varies in this manner.
The electric field (13) due to the dipole distribution causes a potential distribution V(r)/2 over the screen and a potential distribution of −V(r)/2 over the polarization disc, where V(r) is nonuniform as given by (11). But since the polarization disc is a perfect conductor it cannot support voltage gradients, and therefore cannot have the potential distribution −V(r)/2. Instead, the polarization disc is at ground potential. This is where the charge distribution q0(r) comes in; it must be such as to induce a potential distribution V(r)/2 over the polarization disc. Since the distance between polarization disc and screen vanishes in the mathematical model, the potential distribution V(r)/2 is induced over the screen as well. The total potential over the monitor screen thus becomes V(r) of (11), while the total potential distribution over the polarization disc becomes uniformly zero. Both these potential distributions are as physically required. The electric charges q0 are moved into position by polarization and are partly drawn from the earth through the ground connection of the CRT.
In our model the charge distribution q0 is located at the same place as the dipole distribution, viz., on the plane z=0 within the circle with radius R. At points on the center line of the screen, the electric field due to the monopole distribution q0 is calculated in the following manner. As discussed, the monopoles must be such that they cause a potential φ0 that is equal to V(r)/2 over the disc with radius R centered in the plane z=0. Although the charge distribution q0(r) is uniquely defined by this condition, it cannot be calculated easily in a straightforward manner. The difficulty is circumvented by using an intermediate result derived from Excercise 2 on page 191 of Kellogg (1953), where the charge distribution over a thin disc with uniform potential is given. By using this result one readily finds the potential φ*(z) on the axis of this disc as φ * ( z ) = 2 π V * β ( R 1 ) , ( 14 )
Figure US06506148-20030114-M00004
where β(R1) is the angle subtended by the disc radius R1, as viewed from the point z on the disc axis, and V* is the disc potential. The result is used here in an attempt to construct the potential φ0(z) for a disc with the nonuniform potential V(r)/2, by the ansatz of writing the field as due to a linear combination of abstract discs with various radii R1 and potentials, all centered in the plane z=0. In the ansatz the potential on the symmetry axis is written φ 0 ( z ) = α β ( R ) + b ∫ 0 R β ( R 1 ) W , ( 15 )
Figure US06506148-20030114-M00005
where W is chosen as the function 1−R1 2/R2, and the constants a and b are to be determined such that the potential over the plane z=0 is V(r)/2 for radii r ranging from 0 to R, with V(r) given by (11). Carrying out the integration in (15) gives
φ0(z)=αβ(R)−b{(1+z 2 /R 2)β(R)−|z|/R}. (16)
In order to find the potential over the disc r<R in the plane z=0, the function φ0(z) is expanded in powers of z/R for 0<z<R, whereafter the powers zn are replaced by rnPn(cosθ), where the Pn are Legendre polynomials, and (r,θ) are symmetric spherical coordinates centered at the screen center. This procedure amounts to a continuation of the potential from the z-axis into the half ball r0, in such a manner that the Laplace equation is satisfied. The method is discussed by Morse and Feshbach (1953). The “Laplace continuation” allows calculation of the potential φ0 along the surface of the disc r0, the parts (13) and (19) contribute about equally to the electric field over a practical range of distances z. When going behind the monitor where z is negative the monopole field flips sign so that the two parts nearly cancel each other, and the resulting field is very small. Therefore, in the back of the CRT, errors due to imperfections in the theory are relatively large. Moreover our model, which pretends that the polarization charges are all located on the polarization disc, fails to account for the electric field flux that escapes from the outer regions of the back of the screen to the earth or whatever conductors happen to be present in the vincinity of the CRT. This flaw has relatively more serious consequences in the back than in front of the monitor.
Screen emissions in front of a CRT can be cut dramatically by using a grounded conductive transparent shield that is placed over the screen or applied as a coating. Along the lines of our model, the shield amounts to a polarization disc in front of the screen, so that the latter is now sandwiched between to grounded discs. The screen has the pulsed potential distribution V(r) of (11), but no electric flux can escape. The model may be modified by choosing the polarization disc in the back somewhat smaller than the screen disc, by a fraction that serves as a free parameter. The fraction may then be determined from a fit to measured fields, by minimizing the relative standard deviation between experiment and theory.
In each of the electron beams of a CRT, the beam current is a nonlinear function of the driving voltage, i.e., the voltage between cathode and control grid. Since this function is needed in the normalization procedure, it was measured for the 15″ computer monitor that has been used in the ½ Hz sensory resonance experiments and the electric field measurements. Although the beam current density j can be determined, it is easier to measure the luminance, by reading a light meter that is brought right up to the monitor screen. With the RGB values in the VB6 program taken as the same integer K, the luminance of a uniform image is proportional to the image intensity I. The luminance of a uniform image was measured for various values of K. The results were fitted with
I=c 1 K γ, (20)
where c1 is a constant. The best fit, with 6.18% relative standard deviation, was obtained for γ=2.32.
Screen emissions also occur for liquid crystal displays (LCD). The pulsed electric fields may have considerable amplitude for LCDs that have their driving electrodes on opposite sides of the liquid crystal cell, for passive matrix as well as for active matrix design, such as thin film technology (TFT). For arrangements with in-plane switching (IPS) however, the driving electrodes are positioned in a single plane, so that the screen emission is very small. For arrangements other than IPS, the electric field is closely approximated by the frin
Manufactured by Voigtländer & Sohn AG, Braunschweig, West Germany
Model: c. 1955, Type L1 (produced between 1954-1957)
according to Massimo Bertacchi
35 mm film folder / rangefinder camera
Bas-relief on the top plate: VITESSA
Lens: Ultron 50mm f/2.0, six element, bayonet filter mount
Aperture: f/2 - f/22, setting: dial and manual setting lever on the lens-shutter barrel
Focusing: via a wheel on back right side of the top plate,
Rangefinder window: Square shape, in the smaller window on front of the top plate
Focus distance and DOF scale: a rotating dial when focusing, on the top plate
Focus range: 3.3 - 60 feet (1-18m) +inf
Shutter: Synchro-Compur leaf shutter, speeds: 1-1/500 +B
setting : dial and ring on the lens-shutter barrel
Aperture and speeds are coupled and turning the speeds ring also turns the aperture setting
Exposure meter: Selenium cell (flat chequered window, present in early products),
based on the Exposure Value, needle window on the right of the top plate,
metering range 6-200 ASA (EV 2-19),
Exposure setting: after reading your film's ASA's corresponding letter from the plate which shows A to F letters near the needle window, set this letter to EV number dial in the window turning the knob on the back far right side of the top plate,
then read the EV that matches with the needle and apply this EV number to the EV numbers dial by turning the speeds ring for the correct exposure,
(if the EV is out of the speeds range, turn and set again the aperture manually by lifting its lever to fit exact EV)
EV numbers dial: accordig to combined aperture-speed settings is on front of the lens-shutter barrel, aperture setting lever points them
Cocking device: a long Combi-plunger rod, also winds the film, on left side of the top plate,
Always depress the Combi-plunger as far as it will go and then let it come out completely,
could be retracted when the bellows-doors closed, push down until it clicks
Frame counter: advance type, manual setting when the back cover removed ,
the frame count is in a window on left front of the camera,
Shutter release: on the top plate, right side, w/ cable release socket
View finder: coupled viewfinder/rangefinder, Parallax corrected
Re-wind: a folding lever on the bottom plate, right side,
its shaft has a small red line on it., and must rotate once when advancing the film
Re-wind release: a small knob, on the bottom plate
Flash PC socket: on the left side of the bellows-door, synchro. all speeds,
X and M settings via the MXV lever and dial on the lens-shutter barrel
Self-timer: setting via MXV lever and dial on the lens-shutter barrel, V for the self-timer
Opening the bellows-doors: pressing the shutter release, cocking plunger will raise also
Closing the bellows: pushing simutaneously onto the red semi-lunar pressure marks on front of the lens, on 12 and 6 o'clock
There is a small folding supporter piece for standing straight of the camera, just beneath the right door
Back cover: removable, completely detaches with bottom plate and front plates of the body,
(it is hard to imagine of this action, see the detailed photos !..),
opens via a folding latch on center of the bottom plate, turns 90 degrees
Memory dial : for film type, coupled with frame counter
Cold-shoe
Tripod socket: modern 1/4''
Strap lugs
serial no.1270307
Vitessa shows a superb, almost Leica M3 quality fit and finish, uses Exposure Value settings, a system popular in the 1950's. Its design and mechanics are unique in its class, like Voigtlander Prominent's unique design. Voigtlander Vitessa L is the most elegant 35mm Folder camera.
The Vitessa range has several versions and models.
There are several nicknames of Vitessa, eg. in German it was called the Scheunentor, means The Lighthouse named after the unique plunger rod.
The unique front covers are usually referred to as the barndoors.
Timer and temperature gauge a top a stove.
Bloomfield, NJ
This work is licensed under Creative Commons 2.0 Generic.
You are free to share and to remix with attribution.
timered self portrait - kustom weekend 2014 - tuscany - italy - nikon f photomic FTn 1973 - nikkor 20mm f4.0 - agfa apx 25
The sympathetic Express is based on the 1984-1996 Super5, and was designed by Marcello Gandini for Studio Bertone.
1870cc diesel engine (1991-1997).
Production Express Phase I: April 1986-Sept. 1991.
Phase II till 1994 and Phase III till 1999.
New French reg. number: 2001 (Pyrénées-Orientales).
Number seen: 3.
Prades (Pyrénées-Orientales, Fr.), Rue du Chant des Oiseaux, April 25, 2017.
© 2017 Sander Toonen Amsterdam | All Rights Reserved
Box open before final mounting. I cut up the plastic box that the Timer came in, to act as a cover to keep debris out .
Timer can be adjusted for various timer periods.
Elk-960
www.at-fairfax.com/search-results.php?keywords=Elk-960&am...
www.amazon.com/Timer-Module-Delay-Second-Minutes/dp/B004H...
Timer output goes to an added fan relay, mounted under the hood. The same relay is used by the Fan Switch which allows fan to run all the time when need while off roading
PictionID:53762405 - Catalog:14_031990 - Title:GD/Astronautics Details: Agena Sequence Timer; Tech Reworking Timer; Building 33 Clean Room Date: 03/03/1965 - Filename:14_031990.tif - Images from the Convair/General Dynamics Astronautics Atlas Negative Collection. The processing, cataloging and digitization of these images has been made possible by a generous National Historical Publications and Records grant from the National Archives and Records Administration---Please Tag these images so that the information can be permanently stored with the digital file.---Repository: San Diego Air and Space Museum
USA LEGAL Nissan Skyline GTST
Right Hand Drive * RWD
Matching numbers Factory Rb25
5speed
Rb25
Original rb25 fully modified, forged internals, modified head, valves, cams, fully built engine. 2.6L
600hp @ 23psi
For Sale $Email
TURBOPROP55@aol.com
HKS boost guage, AEM a/f guage, blitz voice timer. Eo1 on dash, Eclipse 7'' touchscreen head, cold A/C! Nismo steering wheel. NO Airbags. Nismo shifter. JDM Lighter and ignition upgraded white LED rings.
My Honda 1000rr Race Replica
R34 JDM Special Edition Midnight Purple
Cold A/C and power everything!
No heat
Viper alarm
Nismo Key
Nismo steering wheel No SRS
JDM White LED light for ignition and lighter
Bride Low Max Seats
GTR mats
Bee R wheels 265, 35, 18
JDM lug nuts
Nissan Nismo upgraded brakes
Blitz 4'' race exhaust
Aem standalone Ecu (all safetys removed)
8800 Red Line
AEM 3 bar map
Greddy Eo1 boost controller
Hks electronic Stablizer
HKS boost guage 3 bar
AEM air/fuel wideband
Blitz vioce timer
Eclipse 7'' touchscreen cd/dvd/nav
12w6v2 JL sub w/custom box in trunk
Sirius Radio
GPS & NAV
JL 1000/1 amp
JL 500/4 amp
MB quart / Infinity comp speakers
Yellow Jackets Coils
255 lph fuel pump, Aem fuel filter
750cc injectors
Greddy Intake
Greddy throtttle body
Greddy pipes
GTR axels
GTR rear end
Full Race LSD
ACT 6 puck clutch (safety removed)
Light weight Flywheel
Tein race comp suspension
Hicas 4wd steering
XS T3 T70 Turbo (just installed and tuned)
HKS wastegate
4'' XS FMIC
Turbo Xs BOV
KoyoRad
HKS 3'' downpipe
Custom Header
Greddy oil overflow
N1 oil and water pump
Greddy Timing Belt
10k Oracle Hid's (just updated)
Flush mount JDM blinkers
Front Fog and blinkers removed
Clear blue corner lights
Full JDM aero kit (Front bumper, side skirts, rear lips.)
5% tint
CALL ME 941 284 3907
N5015L North American T-28A Fennec [174-164] (Ex United States Air Force) Santa Monica~N 11/10/1998. Wears false US Navy marks.
Ruger Mk I at top; Ruger Mk II; Ruger Mk IV Hunter.
The Mk II was my third firearms purchase. Everyone ought to have one. I came by the Mk I later. The Mk IV Hunter was love at first sight when I saw it in a Reno gun store (I needed it anyway to replace the Mk II, which I had given to Ingrid, but now that Ingrid is in Reno all the Rugers are together).
I don't own a Mk III, and because of the lame loaded chamber indicator I will probably never buy one.
This photo allows you to see the evolution of the design. I don't shoot the Mk I much because the bolt doesn't lock back on an empty magazine, so you have to use a chamber flag for range safety. The Mk II has an amazing trigger because of some work I did to it long ago (I forget exactly what), so that's another reason it's preferred.
The heft of the Mk IV Hunter due to its bull barrel makes it fun to shoot, but some people get a little fatigued from holding it up.
Quick and dirty firearms photo technique:
I have an old Olympus digital camera at the office, maybe ten years old, set up on a tripod. I put the gun(s) on a table in the warehouse with a (dirty) white top where the light is best, then set up the camera with the tripod. I set it to aperture priority, and close the lens down as far as it will go (in this case, f 8), so even with low light I get crisp focus. You need the tripod because without flash it will be a long exposure.
Then in Photoshop I use the white eyedropper in the Curves dialogue to white out the background. This cleans it up nicely, but also washes the entire image out a bit and you sometimes lose a lot of detail. Then I clean up all the marks and scratches on the table, and use Auto Levels to get the contrast and everything right.
It sounds complicated, but it's actually quick and easy.
So remember these simple steps:
1. Aperture priority;
2. Lens closed down as much as possible (f 8 in my case, but many cameras can go all the way down to f 22);
3. Tripod and timer;
4. Enlarge canvas so you have room to rotate if necessary and improve the crop;
5. White dropper in Curves dialogue;
6. Use the Selector to erase marks and scratches on the background and also to clean up background;
7. Auto Levels;
8. Crop.