Word: reflectors
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...favorite preoccupation of Columnist Arthur Brisbane. Westinghouse engineers who have long worked on the problem were able last summer at Chicago's Century of Progress to operate a tiny fan requiring two or three watts by shooting a beam of short radio waves toward a parabolic reflector which focused on a small antenna. Scientists doubted last week that Mr. Gregory, who is a nurseryman as well as an inventor, could have done any better, and their doubts were magnified by a report that his hidden receiver worked by means of selenium cells...
...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...
Whether or not Mr. Roosevelt is a great leader is a question which cannot be decided on the basis of his actions so far; the final answer can be made only in historical retrospect. One thing, however, is certain. Roosevelt, like Lincoln, is a highly sensitive reflector of public opinion; he possesses an uncanny faculty for gauging the mood of the country, and how it will react to any given measure. The reception accorded by the public to his budget proposals is ample testimony to the truth of this. Everywhere they have met with almost unqualified approval by the people...
...Survey measured the tube to within .063 of an inch. Then Dr. Michelson measured it. At one end of the tube was a 32-sided mirror which could be spun as fast as a bacteriologist's centrifuge. Light from this end raced down the tube, back from a reflector at the other end. The mirror was turned just fast enough for succeeding facets to catch the returning light, send it on repeated journeys down the tube and back. The essential calculation was simple, involved only the speed of the rotating mirror, the number of facets, the length...
...Harvard Observatories are better equipped than any other observatories in the world. There is now in operation at Fontein, a 60-inch reflecting telescope which is the largest telescope in the Southern Hemisphere and within two months a 61-inch reflector, the largest in the Eastern states will be operating at the Oak Ridge station, thus giving Harvard, two high-power telescopes capable of surveying the entire sky. In addition to these telescopes the Southern station has five other telescopes in constant operations. The Oak Ridge station has also five other telescopes and five more are located in Cambridge...