Word: heliostat
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Dates: during 1930-1939
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...from inside the earth, whose core is probably no hotter than 1,500° C. Modern electrical engineers can produce steady temperatures of 2,000° C. in furnaces for the steel industry, and fortnight ago Chemist Robert Browning Sosman of U. S. Steel Corp. announced that with a heliostat and focusing mirror he had been able to capture 3,000° of the sun's heat (TIME, Dec. 21). With gas, temperatures as high as 4,600° have been obtained, but they could not be maintained long. Last week Engineer Frank T. Chesnut of Ajax Electrothermic Corp...
...000º C. on the sun's sizzling surface. Last week Chemist Robert Browning Sosman of U. S. Steel Corp., announced that by extending the principle of the magnifying glass he was able to capture half of the sun's 6,000º heat. With a big specially-built heliostat (reflector) he reflected sunlight on a focusing mirror; the mirror concentrated the rays, focused them on a piece of zirconium oxide, which melts at 1960º C. The zirconium oxide was liquefied. Chemist Sosman estimated he had produced a temperature of 3,000º...