Word: reflector
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Dates: during 1930-1939
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...Chemist W. M. Cohn of Berkeley, Calif, described the solar furnace invented in Germany which he uses for high-temperature work. It consists of a coelostat (flat mirror geared to follow the sun) which feeds the rays into a concave reflector whence they are sharply focused on the substance under treatment. Dr. Cohn uses the sun furnace to make a clear, yellowish, glassy lining for kilns out of zirconium oxide. A half-minute under the reflector melts the oxide at 4,850° F. Higher temperatures than this have been obtained in electric furnaces, but Dr. Cohn believes that...
Thermocouples are activated by infra-red radiation as well as by starlight. It would be possible to put the thermocouple at the focus of a movable parabolic reflector, and to assume, when a peak of electrical activity was noted, that the reflector was trained on some strong source of radiation-such as a metal ship out to sea in the dark. If this is how the Signal Corps' ship-finder works, it differs in no essential detail from the infra-red "Fog-eye" developed by Paul Humphrey Macneil and successfully demonstrated two years ago (TIME...
...Most famed white dwarf, of which only three have definitely been spotted, is the companion of Sirius whose density is approximately half a ton to the cubic inch. *World telescope ranking: Observatory Diameter of Reflector Mt. Wilson........ 100 in. Dunlap (Toronto).....................................74 in. Dominion ...........................................72 in. Perkins (Delaware, Ohio).......................... 69 in. Harvard .....................................................61 in. Argentine National (Cordoba).........................60 in. Harvard (South Africa) ....................................60 in. Berlin-Babelsburg ........................................48½in. Melbourne..................................................... 48 in. †One light-year=approximately six trillion miles. Traveling 186,000 miles per second, light takes only eight minutes to reach Earth from...
...last week the reflecting surface of Mount Wilson Observatory's 100-inch glass mirror, world's largest telescope reflector in use, was covered with a thin film of silver. If it were coated with aluminum, as all Mount Wilson astronomers have long wished, it would quickly acquire a protectively oxidized surface, it could be cleaned with ordinary soap and water and it would seldom if ever have to be removed from the telescope tube...
Edwin Powell Hubble of Mt. Wilson Observatory has at his disposal a 100-inch reflector, world's largest telescope, and with it he takes longer looks into space than any other man. Before the National Academy of Sciences last spring, Astronomer Hubble put the limit of the visible universe at 300,000,000 light-years from Earth (TIME, May 7).* Later he extended the limit to 400,000,000 lightyears. Last week he reported catching on a high-speed photographic plate the faint impression of a galaxy of stars 500,000,000 light-years away...