View allAll Photos Tagged Protractor
Collage, glue, ink on paper.
10" x 13"
2011
Enrique Castrejon
Measured in inches
Scale 1/8" = 1/8"
Enrique Castrejon: Artist Statement
I linearly dissect and cut appropriated images found in variety of eclectic media sources such as newspapers, magazines, advertisements and photographs, art books, Sotheby’s auction catalogs, porn, personal photos and online sources into smaller identifiable geometric shapes. I investigate and describe what I see through measurements. I transform this selected graphic imagery into quantified drawings mapped by measuring distances between points (x inches), at times calculating the varied angle degrees created within the shapes (360˚-A˚= B˚), and/or written data related to the image of each shape. The distances around the shapes are measured in inches and their corresponding degree angles are calculated with a protractor and calculator. These precise measurements abstract the image interfering and altering its fixed meaning, creating other possible interpretations through this linear dissection. The final results are written around the shapes creating an intricate explosive web of verifiable units. This repetitive and meditative process allows me to map out the drawing and reveal the invisible mathematical language found in everything. Also, in creating these fragmented and measured drawings from the cut up parts of the whole and reconfigured, I challenge our perceptions of what is real, forcing us to think critically about information that is constantly bombarding our everyday lives through images selected in directed advertisements, pop-culture sources, editorials and news stories found in printed and online media.
Enrique Castrejon lives and works in Los Angeles, CA. Castrejon’s work is also traveling nationally in a group exhibition called Out of Rubble, organized and curated by Susanne Slavick, that looks at how artists have “reacted to the wake of war – its realities and representations.” Castrejon was also a featured artist and panelist on a KPCC 89.3 radio program, Air Talk with Larry Mantel on the topic of Chicano Art & Pacific Standard Time exhibit with participating artists and panelists Gronk, Patissi Valdez and Sonia Romero.
For this image, I focused on the heart because I was dealing with my father’s double by-pass surgery this past Jan 2012. He unfortunately suffered a heart attack in December and I was struggling to understand his situation and condition. This drawing titled “Heart Measured in Inches” is an image that I created to do something with my anxiety over my father’s health and surgery. Each line coming out from the heart directly points to a measured part of it. Fortunately, my father is progressively getting better after his surgery in Jan. 2013.
Cadets from 10th Regiment, Advanced Camp, completed their land navigation qualification at Fort Knox, Ky., July 28, 2023. Armed with a compass, protractor, pencil, map, and a list of coordinates, the Cadets set out, fueled by determination, to find each of their points in under 4 hours. | Photo by Rosalita Mitchell, Ball State University, CST Public Affairs Office
Cadets from 10th Regiment, Advanced Camp, completed their land navigation qualification at Fort Knox, Ky., July 28, 2023. Armed with a compass, protractor, pencil, map, and a list of coordinates, the Cadets set out, fueled by determination, to find each of their points in under 4 hours. | Photo by Rosalita Mitchell, Ball State University, CST Public Affairs Office
Cartographers used this device to draw or measure accurate azimuths (angles) from one point to another on a map projection that maintained true angles.
Just spent the last couple hours setting up new DV20x2L, after adding the Michael Lim stainless-steel shim to my RB-303 and busting out Don's protractor... let's see how it sounds!
The Fibonacci spiral is found throughout the natural world; for example, in nautilus shells, pine cone scales, & sunflower florets.
A Fibonacci spiral is made by drawing arcs which connect opposite corners of squares in a Fibonacci tiling.
References
Amazing Math Projects You Can Build Yourself by Laszlo C. Bardos
www.amazon.com/Amazing-Math-Projects-Build-Yourself/dp/19...
"Spirals, Fibonacci, & Being a Plant (Part 2)" by Vi Hart
(She demonstrates drawing a Fibonacci petal or leaf arrangement with an "angle-a-tron" of 137.5 degrees starting at 3:30. Demonstrates 137.5 degree angle between tip of one leaf and bottom of neighboring leaf to maximize exposure to sunlight.)
"Angle-a-trons"
(Details on making paper protractors by Vi Hart; she uses 90 degree "angle-a-tron" to make Piet Mondrian style art)
"Fibonacci Numbers, the Golden Section, and the Golden String" by Dr. Ron Knott
A feature on this website highlights Fibonacci spirals on photos of pine cones.
www.maths.surrey.ac.uk/hosted-sites/R.Knott/Fibonacci/fib...
Algebra Game
wordwall.net/resource/2847788/math/one-step-equations
Place Value Game
Money Games
www.sheppardsoftware.com/math.htm
History of Science
What the Ancients Knew by Jack Turner
Episode on Greek Science Discussed Golden Mean and Fibonacci Spiral
www.sciencechannel.com/tv-shows/what-the-ancients-knew/
History of Science Lectures
By Dr. Kerry Magruder (University of Oklahoma)
www.youtube.com/playlist?list=PLTve54sz-eh_P29Sbbv_j3bC97...
University of Oklahoma Library History of Science Collections
libraries.ou.edu/content/history-science-collections
Digital Collections
digital.libraries.ou.edu/homescience.php
Museum of the History of Science
Podcasts by Select Professors and Jim Bennett, Director of the Museum of the History of Science
Dr. Georgia L. Irby (William & Mary)
www.wm.edu/as/classicalstudies/faculty/irby_g.php
Dr. Liba Taub (Whipple Museum, Cambridge University)
10th Regiment, Advanced Camp completes the Land Navigation Course during Cadet Summer Training at Fort Knox, Ky., July 16, 2022. Cadets are given a map, protractor, compass, and must find points on the Land Navigation course without the use of GPS devices. | Photo by 2nd Lt. Courtney Huhta, CST Public Affairs Office
Cadets from 10th Regiment, Advanced Camp, completed their land navigation qualification at Fort Knox, Ky., July 28, 2023. Armed with a compass, protractor, pencil, map, and a list of coordinates, the Cadets set out, fueled by determination, to find each of their points in under 4 hours. | Photo by Rosalita Mitchell, Ball State University, CST Public Affairs Office
Cartographers used this device to draw or measure accurate azimuths (angles) from one point to another on a map projection that maintained true angles.
Cartographers used this device to draw or measure accurate azimuths (angles) from one point to another on a map projection that maintained true angles.
Three transparent protractors are overlaid on top of each other. The protractors are colored cyan, magenta, and yellow. The three protractors are illuminated with white light, sometimes referred to as RGB light. Each protractor absorbs a single primary color of light. The cyan protractor absorbs red light. The magenta protractor absorbs green light. The yellow protractor absorbs blue light. Where two protractors overlap, a single primary color of light shows through. For example, where the cyan and the yellow protractor overlap, the red and blue light are absorbed and the green light is seem shining through. And where the cyan and the magenta protractor overlap, the red and green light are absorbed and the blue light is seem shining through. Finally, where the magenta and the yellow protractor overlap, the green and blue light are absorbed and the red light is seem shining through. This photo illustrates the principles of color subtraction.
More information about color subtraction can be found at The Physics Classroom Tutorial.
Cartographers used this device to draw or measure accurate azimuths (angles) from one point to another on a map projection that maintained true angles.
Cadets of 2nd Regiment, Basic Camp, participate in Land Navigation training at Fort Knox, Ky., July 18, 2022. The Cadets worked in groups to locate at least one out of two points using only a map, compass, protractor and pencil. | Photo by Julia Galli, CST Public Affairs Office
Cadets of 2nd Regiment, Basic Camp, participate in Land Navigation training at Fort Knox, Ky., July 18, 2022. The Cadets worked in groups to locate at least one out of two points using only a map, compass, protractor and pencil. | Photo by Julia Galli, CST Public Affairs Office
10th Regiment, Advanced Camp completes the Land Navigation Course during Cadet Summer Training at Fort Knox, Ky., July 16, 2022. Cadets are given a map, protractor, compass, and must find points on the Land Navigation course without the use of GPS devices. | Photo by 2nd Lt. Courtney Huhta, CST Public Affairs Office
10th Regiment, Advanced Camp completes the Land Navigation Course during Cadet Summer Training at Fort Knox, Ky., July 16, 2022. Cadets are given a map, protractor, compass, and must find points on the Land Navigation course without the use of GPS devices. | Photo by 2nd Lt. Courtney Huhta, CST Public Affairs Office
Cadets of 2nd Regiment, Basic Camp, participate in Land Navigation training at Fort Knox, Ky., July 18, 2022. The Cadets worked in groups to locate at least one out of two points using only a map, compass, protractor and pencil. | Photo by Julia Galli, CST Public Affairs Office
10th Regiment, Advanced Camp completes the Land Navigation Course during Cadet Summer Training at Fort Knox, Ky., July 16, 2022. Cadets are given a map, protractor, compass, and must find points on the Land Navigation course without the use of GPS devices. | Photo by 2nd Lt. Courtney Huhta, CST Public Affairs Office
10th Regiment, Advanced Camp completes the Land Navigation Course during Cadet Summer Training at Fort Knox, Ky., July 16, 2022. Cadets are given a map, protractor, compass, and must find points on the Land Navigation course without the use of GPS devices. | Photo by 2nd Lt. Courtney Huhta, CST Public Affairs Office
DoITPoMS, University of Cambridge
The colours in the image are the result of birefringence and relate to the residual strain in the polystyrene. The pattern of strain is indicative of the flow of material during the injection process and it highlights the injection point (at 152 degrees on the outer scale), and two 'weld lines' (at 338 and on the central bar) where two distinct flows of material meet. The weld line is a common point of failure because there is limited intermixing of the two fronts during the time allowed.
System
Polystyrene (PS)
Composition
Not specified
Reaction
Processing
Polystyrene was injected into a mould from a single point and has flowed round the component to meet at two noticeable 'weld lines'
Applications
Polystyrene is hard and inexpensive and its use is very widespread. CD cases and clear plastic cups are common examples. Domestic appliance casings are also typically made from PS
Sample preparation
Technique
Cross-polarised light microscopy
Contributor
J A Curran
Organisation
Department of Materials Science and Metallurgy, University of Cambridge
ORLANDO, Fla. – The 143d Sustainment Command (Expeditionary) Best Warrior Competition began in earnest today as 12 Soldiers from the 143d ESC and the 321st Military Intelligence Battalion demonstrated their physical power and mental might to complete a gauntlet of Soldier skills.
Dawn had yet to illuminate the lakes and trees blanketing Camp Blanding, Fla., when the Soldiers endured an Physical Fitness Test directed by Army Reserve drill sergeants from A Company, 2nd Battalion, 485th Infantry Regiment (Initial Entry Training) out of Jacksonville, Fla. After completing pushups, sit-ups and a two-mile run, the competitors had less than hour to eat, clean, change uniforms, don rucksacks and step into a van bound for Camp Blanding’s live fire ranges.
The 143d ESC cadre and A-2/485 drill sergeants managed the ranges that tested the each competitor’s competency with the M4 Carbine, M9 Pistol and M203 Grenade Launcher—all while wearing a gas mask. The Soldiers were then ferried deep into Camp Blanding’s dense forest. The troops applied their land navigation skills to physically locate three distant points on a map using only a compass and protractor.
As the hot, dry day relinquished control to a cold, moonless night, the competitors returned to the field with weapons in hands and night vision goggles over their eyes. Muzzle flashes pierced the darkness as the competitors attempted to eliminate their artificially illuminated targets.
The exhausted yet enthusiastic dozen returned then to their barracks to clean weapons, write an essay and prepare for another grueling day that begins with a 10-mile road march.
Photos by Sgt. John L. Carkeet IV, 143d ESC, and Spc. Aaron Barnes, 321st MI BN
A Cadet uses his protractor to determine his point's location at Fort Knox, Ky. July 6, 2019. The Land Navigation Refresher gives Cadets a chance to familiarize themselves with the area they will be navigating as well as reacquaint themselves with the equipment. | Photo by Jacob Hempen, CST Public Affairs Office
A Cadet uses her protractor to determine her point's location at Fort Knox, Ky. July 6, 2019. The Land Navigation Refresher gives Cadets a chance to familiarize themselves with the area they will be navigating as well as reacquaint themselves with the equipment. | Photo by Jacob Hempen, CST Public Affairs Office
Cadets from 10th Regiment, Advanced Camp, completed their land navigation qualification at Fort Knox, Ky., July 28, 2023. Armed with a compass, protractor, pencil, map, and a list of coordinates, the Cadets set out, fueled by determination, to find each of their points in under 4 hours. | Photo by Rosalita Mitchell, Ball State University, CST Public Affairs Office
ORLANDO, Fla. – The 143d Sustainment Command (Expeditionary) Best Warrior Competition began in earnest today as 12 Soldiers from the 143d ESC and the 321st Military Intelligence Battalion demonstrated their physical power and mental might to complete a gauntlet of Soldier skills.
Dawn had yet to illuminate the lakes and trees blanketing Camp Blanding, Fla., when the Soldiers endured an Physical Fitness Test directed by Army Reserve drill sergeants from A Company, 2nd Battalion, 485th Infantry Regiment (Initial Entry Training) out of Jacksonville, Fla. After completing pushups, sit-ups and a two-mile run, the competitors had less than hour to eat, clean, change uniforms, don rucksacks and step into a van bound for Camp Blanding’s live fire ranges.
The 143d ESC cadre and A-2/485 drill sergeants managed the ranges that tested the each competitor’s competency with the M4 Carbine, M9 Pistol and M203 Grenade Launcher—all while wearing a gas mask. The Soldiers were then ferried deep into Camp Blanding’s dense forest. The troops applied their land navigation skills to physically locate three distant points on a map using only a compass and protractor.
As the hot, dry day relinquished control to a cold, moonless night, the competitors returned to the field with weapons in hands and night vision goggles over their eyes. Muzzle flashes pierced the darkness as the competitors attempted to eliminate their artificially illuminated targets.
The exhausted yet enthusiastic dozen returned then to their barracks to clean weapons, write an essay and prepare for another grueling day that begins with a 10-mile road march.
Photos by Sgt. John L. Carkeet IV, 143d ESC, and Spc. Aaron Barnes, 321st MI BN
ORLANDO, Fla. – The 143d Sustainment Command (Expeditionary) Best Warrior Competition began in earnest today as 12 Soldiers from the 143d ESC and the 321st Military Intelligence Battalion demonstrated their physical power and mental might to complete a gauntlet of Soldier skills.
Dawn had yet to illuminate the lakes and trees blanketing Camp Blanding, Fla., when the Soldiers endured an Physical Fitness Test directed by Army Reserve drill sergeants from A Company, 2nd Battalion, 485th Infantry Regiment (Initial Entry Training) out of Jacksonville, Fla. After completing pushups, sit-ups and a two-mile run, the competitors had less than hour to eat, clean, change uniforms, don rucksacks and step into a van bound for Camp Blanding’s live fire ranges.
The 143d ESC cadre and A-2/485 drill sergeants managed the ranges that tested the each competitor’s competency with the M4 Carbine, M9 Pistol and M203 Grenade Launcher—all while wearing a gas mask. The Soldiers were then ferried deep into Camp Blanding’s dense forest. The troops applied their land navigation skills to physically locate three distant points on a map using only a compass and protractor.
As the hot, dry day relinquished control to a cold, moonless night, the competitors returned to the field with weapons in hands and night vision goggles over their eyes. Muzzle flashes pierced the darkness as the competitors attempted to eliminate their artificially illuminated targets.
The exhausted yet enthusiastic dozen returned then to their barracks to clean weapons, write an essay and prepare for another grueling day that begins with a 10-mile road march.
Photos by Sgt. John L. Carkeet IV, 143d ESC, and Spc. Aaron Barnes, 321st MI BN
Enrique Castrejon
Collage, ink, pencil on paper.
15"x20"
2008
Measured in inches
Scale 1/8" = 1/8"
Angle Degrees Equation:
(360˚- X˚= Y˚)
N. Teotico Collection
Enrique Castrejon: Artist Statement 2013
Images of beauty, queer bodies, HIV, war, death, destruction and tragic current events are elements that inspire my work. I linearly dissect and cut appropriated images found in variety of eclectic media sources such as newspapers, magazines, advertisements and photographs, art books, Sotheby’s auction catalogs, porn, personal photos and online sources into smaller identifiable geometric shapes. I investigate and describe what I see through measurements. I transform this selected graphic imagery into quantified drawings mapped by measuring distances between points (x inches), at times calculating the varied angle degrees created within the shapes (360˚-A˚= B˚), and/or written data related to the image of each shape. The distances around the shapes are measured in inches and their corresponding degree angles are calculated with a protractor and calculator. These precise measurements abstract the image interfering and altering its fixed meaning, creating other possible interpretations through this linear dissection. The final results are written around the shapes creating an intricate explosive web of verifiable units. This repetitive and meditative process allows me to map out the drawing and reveal the invisible mathematical language found in everything. Also, in creating these fragmented and measured drawings from the cut up parts of the whole and reconfigured, I challenge our perceptions of what is real, forcing us to think critically about information that is constantly bombarding our everyday lives through images selected in directed advertisements, pop-culture sources, editorials and news stories found in printed and online media.
Enrique Castrejon lives and works in Los Angeles, CA. Currently, a solo exhibition of his work, Axiom of Solitude: Investigations & Meditations, is on view at Bermudez Projects Downtown from September 28th to November 26th, 2013. Castrejon’s work is also traveling nationally in a group exhibition called Out of Rubble, organized and curated by Susanne Slavick, that looks at how artists have “reacted to the wake of war – its realities and representations.” Castrejon was also a featured artist and panelist on a KPCC 89.3 radio program, Air Talk with Larry Mantel on the topic of Chicano Art & Pacific Standard Time exhibit with participating artists and panelists Gronk, Patissi Valdez and Sonia Romero.
There isn't any 21-Piece models today, 21st. July. Instead, I post the diagrams and hope that this series would be continue by anyone who is interested. Basically, the module itself is just a Kite Base with one reverse fold. Theoretically, an infinite number of modules is possible, simply by changing the angle of that reverse fold.
The diagrams on first page is for the 8-Piece model. The angle that needs to be changed for n number of modules is on step 2. The rest of the folding are the same. For cosmetic purpose, I have included step 5 to reveal some of the reverse side of the paper. This can be skipped if you are using Chiyogami papers with repeating patterns or squares cut from flyers.
The photo diagram is just an example of locating an odd angle by using a protractor. I have included a table to show the angles for 5 to 25 modules assemblies. For more modules, the formula to obtain the angle is simply, 360 divided by n, where n represents the number of modules. Example, for a 36-Piece model, 360 divided by 36 = 10 degrees.
Many thanks to Andrey Hechuev's 8-Piece New-Found Hope Star which has inspired me to come up with this Expandable Pinwheel Series.
These diagrams are also posted at my website, hosted by Nick Robinson and kindly sponsored by Dennis Walker. Click on "Diagrams" and then scroll down to select under "Modular" -
The value "61 degrees" doesn't mean anything unless a reference frame is specified. On compasses used for navigation, North is the primary axis and all angles are given as degrees clockwise from North. In math class, the + x axis is the primary axis and all angles are given as degrees counter-clockwise from x. Both are valid, as are any other reference axes. Usually we'll just use an angle inside one of our force triangles and know that we tell if something is positive or negative from the direction its going in the picture.
That said, sines and cosines work if you use the angle from the positive x-axis. I've shown this with this picture. When you do the angle like this the calculator will give you whether you're talking about something in this reference frame to the left/down (negative) or to the right/up (positive).
To make your life easier, use these greater than 90 degree angles in this lab, because they're what you're reading directly off the protractor. The math that comes next will do so. We use the internal angle to decide which trig function to use (using SOH-CAH-TOA) and then directly plug the angle from the protractor in.
I was going to gloss over this detail in class, but two 8th period students during the 2016-17 school year wanted a mathematical justification of this, so we stayed after school and came up with this picture
This is a slightly different view of the wasp nest I have been showing you.
I wanted to give you an idea of how uniform these structures can be, yes, but I also want to show you that there's something to their construction that makes them even more impressive: bugs did this.
These wasps have very tiny brains, very small limbs, and not much in the way of a lifespan. A wasp chewed some wood into a goop before carefully laying it out in a very specific way. It didn't have a protractor, it didn't have a ruler, it didn't have a plan to follow. It did this from instructions that are as hard-coded as our desire to seek shelter from the elements.
A wasp, and then a few more wasps, did this . . . not using their hands but their mouths . . . not using their brains but their instinct.
Amazing.
A Cadet uses his protractor to determine his point's location at Fort Knox, Ky. July 6, 2019. The Land Navigation Refresher gives Cadets a chance to familiarize themselves with the area they will be navigating as well as reacquaint themselves with the equipment. | Photo by Jacob Hempen, CST Public Affairs Office
ORLANDO, Fla. – The 143d Sustainment Command (Expeditionary) Best Warrior Competition began in earnest today as 12 Soldiers from the 143d ESC and the 321st Military Intelligence Battalion demonstrated their physical power and mental might to complete a gauntlet of Soldier skills.
Dawn had yet to illuminate the lakes and trees blanketing Camp Blanding, Fla., when the Soldiers endured an Physical Fitness Test directed by Army Reserve drill sergeants from A Company, 2nd Battalion, 485th Infantry Regiment (Initial Entry Training) out of Jacksonville, Fla. After completing pushups, sit-ups and a two-mile run, the competitors had less than hour to eat, clean, change uniforms, don rucksacks and step into a van bound for Camp Blanding’s live fire ranges.
The 143d ESC cadre and A-2/485 drill sergeants managed the ranges that tested the each competitor’s competency with the M4 Carbine, M9 Pistol and M203 Grenade Launcher—all while wearing a gas mask. The Soldiers were then ferried deep into Camp Blanding’s dense forest. The troops applied their land navigation skills to physically locate three distant points on a map using only a compass and protractor.
As the hot, dry day relinquished control to a cold, moonless night, the competitors returned to the field with weapons in hands and night vision goggles over their eyes. Muzzle flashes pierced the darkness as the competitors attempted to eliminate their artificially illuminated targets.
The exhausted yet enthusiastic dozen returned then to their barracks to clean weapons, write an essay and prepare for another grueling day that begins with a 10-mile road march.
Photos by Sgt. John L. Carkeet IV, 143d ESC, and Spc. Aaron Barnes, 321st MI BN
Asian Pied Starling/ Pied Myna
The pied myna or Asian pied starling (Gracupica contra) is a species of starling found in the Indian subcontinent and Southeast Asia. They are usually found in small groups mainly on the plains and low foothills. They are often seen within cities and villages although they are not as bold as the common myna. They produce a range of calls made up of liquid notes. Several slight plumage variations exist in the populations and about five subspecies are named.
The species has been included in the genus Sturnus and Sturnopastor in the past but recent studies do not support its inclusion within Sturnus leading to the reinstatement of an older genus name Gracupica. It has been claimed that the species name "contra" is derived from an Indian name for it, although this has not been traced subsequently.
Heads of subspecies G. c. contra (top), G. c. superciliaris (middle), and G. c. jalla (bottom); illustration by Joseph Smit, 1890
The nominate subspecies (based on the species description given by Linnaeus in 1758) is found mainly along the Gangetic plains extending south into Andhra Pradesh and east to Bangladesh. The population in northeastern India (Sadiya to Tirap and the Naga Hills) was named as sordida (originally Sturnus contra sordidus) by Sidney Dillon Ripley in 1950. This form differs from the Indian form in having reduced streaking on the shoulders and nape. The populations in Manipur south to Myanmar and east to Yunnan have the white extending over the eye and are included in the subspecies superciliaris first described by Edward Blyth in 1863. The subspecies in Thailand, Laos and Cambodia is included in floweri ( Sharpe, 1897) while jalla described by Horsfield in 1821 is found on Sumatra, Java and Bali.
This myna is strikingly marked in black and white and has a yellowish bill with a reddish bill base. The bare skin around the eye is reddish. The upper body, throat and breast are black while the cheek, lores, wing coverts and rump are contrastingly white. The sexes are similar in plumage but young birds have dark brown in place of black. The subspecies vary slightly in plumage, extent of streaking of the feathers and in measurements.
The flight is slow and butterfly-like on round wings.
Leucistic individuals have been recorded.
The species is found mainly in the plains but in the foothills up to about 700m above sea level. They are found mainly in areas with access to open water. Their main distribution in India is in the Gangetic plains but extending south to the Krishna River. Their range is increasing, with populations establishing more recently in Pakistan, Rajkot, and Bombay (since 1953), possibly aided by trade in caged birds and accidental escape. Their westerward spread in India particularly in parts of Rajasthan has been aided by changes in irrigation and farming patterns, and the spread into Sumatra has been aided by deforestation. The species has also established itself in Dubai, UAE.
The habitat is lowland open areas with scattered trees near water, often near human habitation. This species is often seen at sewage farms and refuse tips.
These starlings are usual found in small groups, foraging mainly on the ground but perching on trees and buildings. Birds in a group call frequently with a wide repertoire that includes whistles, trills, buzzes, clicks, and warbling calls. Young birds taken into captivity have been trained to imitate tunes of other birds.
Both sexes sing. They forage in fields, lawns and on open ground feeding on grains, fruit, insects, earthworms and molluscs usually taken from the ground. Like many other starlings, they often use a prying or gaping action, piercing soil and then opening apart the bill to dislodge hidden food. The strong protractor muscles allow them to part a mat of grass and their eyes are positioned to obtain a binocular view of the space between the parted beak. They often feed in grazing land or among cattle.
The breeding season in India is spread from March to September. With the onset of breeding, the sizes of flocks decline and birds pair up. Courtship involves calling, fluffing of the feathers and head bobbing. The nest is a loose mass of straw formed into a dome with an entrance on the side and placed in a large tree (often banyan, mango, jackfruit, rosewood) or sometimes on man-made structures, often close to human habitation. Several pairs will breed in the same vicinity. The usual clutch is made up of about four to six glossy blue eggs. Each egg is laid with a day in between and incubation begins only after the third or fourth egg is laid. The eggs hatch after 14 to 15 days. The young are brooded for two weeks, the female staying at the nest during the night. Both parents feed the chicks until they fledge and leave after three weeks. More than one brood may be raised in a season.
An instance of interspecific feeding, where an adult of a common myna fed a young pied myna has been reported.
These mynas form communal roosts at night and jointly defend nesting areas.
The ability of these mynas to mimic human voices made them popular as cagebirds. The Sema Nagas will not eat this bird as they believe it is the reincarnation of a human. They are considered to be generally beneficial because they eat many insects.
Taking into account the necessary tools for demonstations I had to make some alterations/additions to the interior of the box. Pictured here are a sandbag, upon which to engrave the blocks, a small brass container to hold french chalk to rub into the engraved lines, a tiny homemade inking ball made around a thread spool, a protractor and a small square are inserted into the top of the box.
Cadets from 10th Regiment, Advanced Camp, completed their land navigation qualification at Fort Knox, Ky., July 28, 2023. Armed with a compass, protractor, pencil, map, and a list of coordinates, the Cadets set out, fueled by determination, to find each of their points in under 4 hours. | Photo by Rosalita Mitchell, Ball State University, CST Public Affairs Office
70.27.D- -Image from the SDASM Curatorial Collection. This item is currently on display in the Museum Rotunda. Note: This material may be protected by Copyright Law (Title 17 U.S.C.)--Repository: San Diego Air and Space Museum