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This Hartl Optical Disk from 1925 is part of the "Dynamic Equilibrium" display at the Nott Memorial on the campus of Union College in Schenectady. The display explores the intersection of art and science.
The Hartl Optical Disk is designed to demonstrate important principles of optics, such as reflection by various shapes of mirrors, refraction through several types of lenses, total internal reflection and dispersion. The apparatus consists of a satin finished metallic disc about 30mm in diameter, graduated around the circumference. On the back of the disc is a handle that is used to to rotate the disk through 360 degrees in a vertical line about a horizontal axis perpendicular to the plane and passing through the center of the disc. The disc is partially shield by a fully-adjustable hood. On the hood, a circular plate has slits to allow rays of light to pass through and fall on the optical elements. The hood also has a slot for placing red, green, and blue filters.
Now for the photo info: I started out thinking that a 5 exposure HDR would look good, however the background was too overpowering. So I clipped the disk from the photo, and made two copies of the background. The base copy was convered into B&W and the overlying copy was blured slightly and made 40% transparent.
Let me know what you think of it...
A carved stone disk from the Asian Art Museum in San Francisco. (One of my favorite museums of the world, and they even let you take photos!)
Game on disk for the Commodore 64. Rare version 1.0. These were very quickly replaced by version 1.2
How to check hard disk health on Linux using smartmontools
If you would like to use this photo, be sure to place a proper attribution linking to xmodulo.com
USB flash disk miniaturních rozměrů s vysouvacím mini USB konektorem. Vhodný k laseru i tisku reklamního loga. Díky nízké hmotnosti a malým rozměrům je ideálním přívěškem na klíče, Vaši klienti jej tak mohou mít vždy u sebe.
Sky-Watcher Star Adventurer
Sky-Watcher Evostar 72ED
Lacerta Herschel Wedge (replaced ND3 with ND1.8)
ZWO EFW
ZWO IR850 filter (>850nm)
Baader Solar Continuum filter (540nm, 10nm)
Altair Astro NUV filter (395nm, 7nm)
ZWO ASI174MM
FireCapture v2.7beta
Ubuntu 18.04 (kernel 5.0)
PIPP for cropping out
AS!3 for stacking (2x resample)
ImPPG for sharpening
RawTherapee for colorization and final tweaks
Gimp to annotate images
ffmpeg to create the video
Second shipment - rusty, scored, greasy rotors, not described. The closer pair were cleaned up using spray brake parts cleaner and a rag. The left one of the upper pair, first shipment, show evidence of a half-hour's work with brake parts cleaning fluid and a Scotch scrubber pad.
They strung me along with empty promises until the dispute period expired, then ignored my pleas. More fool me, but that makes them thieves, doesn't it?
(Someone asked for an update: It's been two years or more. The point was: Even such high-volume and highly-regarded sellers can be rats from time to time. If they have something you want, at a price you like, it will probably be a problem-free transaction, but don't be surprised if there is something wrong, and do your objection and claims routines early. Don't let them run out the dispute period, as I did.
Matter of fact, I have something coming from them tomorrow (03 June 2009). We'll see how it develops ...)
(A week later: This one was perfect: excellent price, careful packing, timely delivery of an item that is exactly as advertised. I guess every one is a gamble; win a couple, lose a couple.)
Some old hard disk I had with me. This one is maxtor 10GB..finally I Found the star-screwdriver that can open this thing.. :)
Verse
"Remember your Creator in the days of your youth."
(Ecclesiastes 12:1)
Explanation
The disk only has energy to spin for a small amount of time.
Remember to follow God and use your time wisely while you have energy.
Shown in Video
Euler's Disk by Toysmith (Damert in Auburn, Washington) with magnetic holographic triangles.
Heard in Video
Horn Concerto (Rondo in E-Flat, K. 371) composed by Mozart, performed by the English Chamber Orchestra, Jia Lu & Xiao-Mind Han
This is where I found all the photos from 10 years ago. A couple of these disks actually have my older website designs and content from christiangrantham.com
13Aug2010
Got a new computer today and backed up the old one before the migration. Fun thing to do on a rainy day :)
camera info: 7D | 17-55mm(ƒ/2.8) | ƒ/3.5 | ISO 400 | 1/20s
Preparing for a move I took time to discard a lot of old things we don't use anymore. 3.5 inch floppy disks were part of the lot. I just saved these. Maybe to be able to tell my grand-children that I was there! ;-)
A front Brake Disc with heat spots and run out that causes noises, brake pedal and steering wheel shudder during braking.
Not for long though. Out comes the PFM900 On Car Brake Lathe
Pen holders are useful, and for the first time in almost 10 years floppy disks are too.
This version is made using glue to stick 5 disks together. Another version on Instructables uses a drill and cable ties.
foto por: Priscila Lima
priscilalimafotos.blogspot.com
Lomo Fisheye
Fujifilm Superia ISO 400
Rio de Janeiro - novembro de 2011