Word: reflector
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Dates: during 1940-1949
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...lights, which are powerful lamps of the reflector type, have already been placed in the Eliot House dining hall, and the Maintenance Department is planning to extend the innovation to all of the Houses. The lights are connected by a special circuit to the regular illuminating system of each room in which they are installed, and an automatic switch throws the emergency system as soon as the regular circuit for any reason fails...
...compact new sun lamp, combining warming infrared and tanning ultraviolet rays, that needs no reflector, can be plugged into any electric outlet...
...walls of Jericho, men have been making horns the wrong way," said Professor Frederick K. Kirsten of the University of Washington. Without actually saying that his horn was better than Joshua's, he announced that he had invented a horn to outshout all horns. Called a parabolic reflector type of air-raid siren, Professor Kirsten's horn has a ten-foot wooden cup which focuses the siren's shriek into a single noise beam, instead of throwing it to the four winds, and the reflector rotates the beam, like the beam of a lighthouse. With a small...
More exciting to astronomers than a flaming new comet is the Schmidt star camera. It will clearly photograph 500 times as much sky as the small area (1° in diameter) now recorded by ordinary reflector telescopes, yet it requires an exposure only one-tenth as long as the fastest astronomical lenses previously used. Equally valuable in aerial photography for its speed and wide, clear focus, the camera is being adopted by the U.S. Army...
Inventor of the camera, the late Bernhard Schmidt of Germany's Hamburg-Bergedorf Observatory first described the device in 1931, but with uncooperative vagueness unusual in a scientist. U.S. astronomers-mostly amateurs-grasped Schmidt's hints, figured out how his lens, reflector and film must have been designed and assembled. When they had cleared up details in several experimental models, major U.S. observatories began building larger Schmidts. The biggest (24-36 inch) was dedicated last fortnight at Cleveland's Warner & Swasey Observatory, and others are nearing completion this week at Harvard, Mt. Palomar, Tonantzintla, Mexico...