Howe, Herbert A. (Herbert Alonzo), 1858-1926 · Meadville, Penna., Flood and Vincent · leaf 148
only must the different parts be correctly pro-portioned, but each must be made of the propermaterial. Steel of various degrees of hardness, cast-iron, wrought-iron, brass, copper, lead, phosphor-bronze, silver, German silver, nickel, hard rubber,wood, carbon, glass, vegetable fiber, and even… … Fig. 75.—The Chamberlin Telescope of the University of Denver. The tons of metal which compose the moving parts of Electhe great Yerkes telescope are moved in any direction,swiftly or slowly, by means of electric motors. The trie motors. 142 A Study of the Sky. astronomer presses the button, the…
Astronomy
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