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Scientific American, Vol. 57, No. 16 (1887) (1887)
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and the valve is moved to and fro, +O oo Radiations frem Melting Platinum and Silver. M. J. Violle has studied these radiations by means of a thermopile, one surface of which received the ra- The levers, P, F, and H, are so proportioned diations and the other was exposed to a known source of heat… … IMPROVED VARIABLE EXPANSION GEAR, © 1887 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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