Read Elementary Optics and Applications to Fire Control Instruments; May, 1921

Elementary Optics and Applications to Fire Control Instruments; May, 1921

U.S. Army Ordnance Department

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Description:This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1922 edition. Excerpt: ...the true stereoscopic relief from the relief obtained by the use of perspective or light and shade. The illusion produced by the last two would persist if one eye were closed, while it is absolutely necessary that both eyes be employed if stereoscopic relief is to be secured. Fig. 58.--Stereoscopic vision. Fig. 59.--Stereoscopic picture. When the distance from an observer to an object exceeds a certain distance, the angle subtended by the two eyes is so small that the images received by both eyes are sensibly alike. True stereoscopic effect then ceases to exist and any appearance of relief beyond this point is duo to perspective or light and shade. Some authorities consider that the distance at which the eyes subtend an angle of 30 seconds is the limiting distance or radius of stereoscopic vision, as it is termed. The eyes are separated approximately 2.6 inches. On this basis the radius of steroscopic vision is approximately 500 yards. If, however, a pair of binoculars is employed, the radius of stereoscopic vision is much increased. In the first place, if the binocular is 6 power, an angle of 5 seconds after magnification is apparently an angle of 30 seconds. Therefore, the radius of stereoscopic vision with the binoculars should be the distance at which the eyes subtend an angle of 5 seconds, i. e., six times 500 or 3,000 yards. Furthermore, if the individual telescopes of the binoculars are of the Porro type, the maker turns the telescopes so that the objectives are farther apart than the eye pieces. In other words, the observer views the object from the two objectives which are separated, let us say, twice as far as the eyes. This, then, doubles the radius of stereoscopic vision so that with the service 6-power glasses it is...We have made it easy for you to find a PDF Ebooks without any digging. And by having access to our ebooks online or by storing it on your computer, you have convenient answers with Elementary Optics and Applications to Fire Control Instruments; May, 1921. To get started finding Elementary Optics and Applications to Fire Control Instruments; May, 1921, you are right to find our website which has a comprehensive collection of manuals listed.
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ISBN: 1230733663

Description: This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1922 edition. Excerpt: ...the true stereoscopic relief from the relief obtained by the use of perspective or light and shade. The illusion produced by the last two would persist if one eye were closed, while it is absolutely necessary that both eyes be employed if stereoscopic relief is to be secured. Fig. 58.--Stereoscopic vision. Fig. 59.--Stereoscopic picture. When the distance from an observer to an object exceeds a certain distance, the angle subtended by the two eyes is so small that the images received by both eyes are sensibly alike. True stereoscopic effect then ceases to exist and any appearance of relief beyond this point is duo to perspective or light and shade. Some authorities consider that the distance at which the eyes subtend an angle of 30 seconds is the limiting distance or radius of stereoscopic vision, as it is termed. The eyes are separated approximately 2.6 inches. On this basis the radius of steroscopic vision is approximately 500 yards. If, however, a pair of binoculars is employed, the radius of stereoscopic vision is much increased. In the first place, if the binocular is 6 power, an angle of 5 seconds after magnification is apparently an angle of 30 seconds. Therefore, the radius of stereoscopic vision with the binoculars should be the distance at which the eyes subtend an angle of 5 seconds, i. e., six times 500 or 3,000 yards. Furthermore, if the individual telescopes of the binoculars are of the Porro type, the maker turns the telescopes so that the objectives are farther apart than the eye pieces. In other words, the observer views the object from the two objectives which are separated, let us say, twice as far as the eyes. This, then, doubles the radius of stereoscopic vision so that with the service 6-power glasses it is...We have made it easy for you to find a PDF Ebooks without any digging. And by having access to our ebooks online or by storing it on your computer, you have convenient answers with Elementary Optics and Applications to Fire Control Instruments; May, 1921. To get started finding Elementary Optics and Applications to Fire Control Instruments; May, 1921, you are right to find our website which has a comprehensive collection of manuals listed.
Our library is the biggest of these that have literally hundreds of thousands of different products represented.

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Elementary Optics and Applications to Fire Control Instruments; May, 1921

Elementary Optics and Applications to Fire Control Instruments; May, 1921

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