Word: polaroid
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Dates: during 1930-1939
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...century scientists have been polarizing light with small natural crystals. Lately a synthetic polarizing material called Polaroid has been developed which can be fabricated into large sheets. In American Optical Co.'s gadget, light from an illuminated test chart first passes through a disk of Polaroid. The person being tested looks through a pair of polarizing lenses, one vertical, one horizontal. By rotating the first disk, the examiner can cut out the vision of either eye at will, so that the subject does not know with which eye he is seeing. It is thus impossible...
...movies were presented by George W. Wheelwright '24, representative of the Polaroid Corporation which is developing light control by polarization, for commercial purposes...
Every phenomena in which light and glass are involved will be affected by this discovery. Of primary importance will be its practical application in eliminating 90 percent of headlight glare of oncoming cars. However this can be achieved only when Polaroid is in general use for, in order to be effective the wind shield must be polarized as well as the glass in auto headlamps...
Discovered in the 17th Century, polarization has become an elaborate science using small, costly, natural crystals like Iceland spar. Polaroid's sponsors say that it will do anything expensive crystals will, can be inexpensively manufactured in any size. Actual cost figures will probably not be available until large-scale equipment is set up. Developed by Physicist Edwin H. Land, senior partner of an independent Boston laboratory, Polaroid's synthetic organic crystals are bound in a plastic film of cellulose acetate. The tiny crystals are pulled into parallel alignment by stretching the film. The material polarizes about...
...laboratory practice, a light beam's "fence" is a crystal, and the gaps which comb light are a crystal's parallel planes of cleavage. Polaroid is a suspension of crystals. The dazzling headlights at last week's demonstration were dimmed because the Polaroid in the lenses and in the windshield was aligned in conflicting directions. The light could thus pass through one but not through both...