. 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. 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 t
. 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. 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 feetor so. The unequal curves of the mirror arefor the purpose of eliminating the spher-ical aberration. 172 ELECTRIC POWER AND DEVICES. 414. ELECTRIC ENGINE STOP. Monarch type. The mag-nets, A, are placed in circuit with an electric battery, and when circuit is rSPROCKET DRUM ^^////;/;//,j////////j/;//,;y^^
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