Mechanical appliances, mechanical movements and novelties of construction; a complete work and a continuation, as a second volume, of the author's book entitled "Mechanical movements, powers and devices" ... including an explanatory chapter on the leading conceptions of perpetual motion existing during the past three centuries (1914)
Hiscox, Gardner Dexter, 1822?-1908 · New York, N. W. Henley Publishing · leaf 174
413. SEARCH-LIGHT … MIRROR. Silvered back. The lensmirror is accurately ground and polishedto the exact curvature required to givea perfectly parallel beam, and with ahalf-foot acetylene flame it will showup the whole road for over 1,500 feet;the same size flame with the best metalreflector will show only a hundred…
Mechanical movements
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