Word: infra
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...Franklin Institute's John Scott medal for electrical research a year later. He lectures at New York University. During the seven years he has worked on radiovoting, sometimes in the secrecy of New Jersey's woodlands, many a corollary idea has struck him. One is to use infra-red radiation ("dark light") for voting in theatres, with a battery of infra-red projectors and photo-electric detectors on the stage measuring the audience's reaction as in pitch-darkness each member holds up a hand reflector-gilded (reflecting) side for "yes," black (nonreflecting) side...
Last week plump-cheeked Dr. Zworykin announced that his iconoscope was ready for use as the "eye" of a powerful ultramicroscope. Its field of operation extends on both sides of the visible light spectrum -up to 10,000 angstrom units on the infra-red range, down to 1,000 on the ultra-violet.* This point on the ultraviolet side is 2,000 units lower than in other ultramicroscopes. If organisms never seen by human eye do exist in the filtrable viruses of common colds and infantile paralysis, they might be detected by light of such short wavelength. Light of longer...
...history, with changes taking place all around you in the University which will have would-wide significance in the field of higher education and with your student body "on the spot" as a result of the attempt to make Harvard University a narrowing and deadening center of super-intellectual infra-humans. . . etc., you write about Huey Long and Nawn, etc. As if we cared. Veritas...
...Infra-red rays, invisible and insensible, pierce much farther through fog than visible light. With cameras using infra-red-sensitive film, special lenses and filters, mountains lost in haze have been photographed from hundreds of miles away, group pictures of people have been taken in pitch-black rooms...
What interested the U. S. Lines in the Williams infra-red camera was the speed with which the negative could be viewed after exposure. The long, tripod-mounted duralumin box contains its own "dark room." As soon as a portion of film is exposed it is fed swiftly into a developing bath, then into a fixing bath after which it is illuminated for examination. Elapsed time: 30 seconds. Thus a skipper can safely photograph his way through otherwise unnavigable fog provided nothing crosses his path at a distance less than his ship travels in half a minute...