Word: heliostats
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...huge to follow the sun itself, the parabolic reflector depends on the help of 63 smaller mirrors set in eight rows on a terraced slope in front of it. Called heliostats (from the Greek helios, sun; statos, to cause to stand still), they track the solar disk across the sky, capture its light and bounce it in parallel beams into the big mirror. The system involves some ingenious engineering. Each heliostat is controlled by its own photoelectric cells. Whenever one of the hehostats (each of which is made 180 individual mirrors) loses its lock on the sun, these tiny electric...
They bored a slanting shaft deep into their mountain (see diagram). Above the shaft they mounted a heliostat (a flat mirror). As the mirror turns to follow the sun across the sky, it reflects the sun's rays down the shaft where they are reflected back and focused by a concave mirror. Bounced back toward the top of the shaft, the light is intercepted at ground level by another mirror and angled into a vertical well. There the sun's image can be examined on a flat screen, photographed, or studied with a spectrograph...
...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...
...will be particularly appreciated this fall while the gymnasium is closed. Besides the routine marching and training in the manual of arms, there is drill in marching, skirmish practice, presentation of colors, and the like. If enough men join the company there will also be signalling by flag and heliostat. In the spring there is rifle practice, the government providing ammunition and targets...