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Unique Kodak 3-D Projection System
ANEW three-dimensional technique for studying air turbulence has been developed by Kodak scientists. Part of studies designed to improve cameras and film for taking pictures at long range, the new 3-D technique can pinpoint moving pockets of air that deviate light rays and interfere with aerial and similar long-distance photography.
The pockets of air under study by the Kodak research team are from four inches to six feet in diameter. The air pockets have a temperature a fraction
of a degree higher or lower than the surrounding air. As a result they have a refractive index different from the rest of the air. This deviates some of the light rays and causes fuzziness of the image in long-distance photographs. Because wind causes movement of the air pockets, watching their images on a screen is like looking at a waterfall sideways. At lonely Canadice Lake, N.Y., the scientists set up two high-intensity light sources focused on a screen 1.3 miles across the north end of the lake.
Consistent Maximum Light of Greater Economy
DIAMOND
PROJECTION
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Each of the light sources was polarized with a filter. Behind the screen, designed for rear projection, stood an observer wearing a pair of spectacles like those once used to view 3-D movies.
1.3-Mile Look — See Into Space
A pattern of "shadows" in constant motion appeared on the screen, with each of the light sources producing a shadow of the pocket in a different place on the screen. The observer with the 3-D glasses could thus "'look into" the space between the screen and the light source^ — getting an effect of depth — and judge the distance of each pocket from the screen.
Knowing the distance between the light sources and the distance between the shadows appearing on the screen, the scientists were able to calculate through triangulation the distance of the disturbances from the screen.
The Kodak scientists also took pictures of the screen images by holding a large piece of film directly in front of the screen, and using a shutter on one distant light source.
B&L's Big-Lens Design For Stock Exchange
Members of The New York Stock Exchange are taking a brand new look at the ticker tape these days. Recently, Bausch & Lomb Optical Co. designed and manufactured a giant projection lens which has been installed at the
Comparison between the mammoth-size B&L
projection lens used at N. Y. Stock Exchange
and the lens (left) used in the B&L slide
projector.
Stock Exchange's Wall Street (N.Y.) headquarters. The new lens is the heart of a projection system for showing ticker tape quotations and bids on a screen.
The lens allows data on the standard %-inch tape to be projected 106 feet across the Exchange floor onto a large wall screen. The individual letters and figures are 2 feet high and the section of the tape is magnified to 14 feet long, making statistics easily legible from all areas in the room. Since the actual moving tape is automatically fed directly
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INTERNATIONAL PROJECTIONIST
FEBRUARY 1959