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Mechanical applicances, mechanical movements and novelties of construction; a complete work and a continuation, as a second volume, of the author's book entitled "Mechanical mvements, powers and devices"; (1917)

Hiscox, Gardner Dexter, 1822?-1908 · New York, The Norman W. Henley publishing company · leaf 188

An illustration from Mechanical applicances, mechanical movements and novelties of construction; a complete work and a continuation, as a second volume, of the author's book entitled "Mechanical mvements, powers and devices";, 1917, leaf 188
442. ELECTRIC FIRE-ALARM SYSTEM,Jersey City, N. J. Signal post and call box. Thebells are rung by mechanism actuated by a de-scending weight of 3,000 lb. When on closed cir-cuit, the armature is held by the magnet and themotion is arrested. When the circuit is opened,the armature falls back from…

Mechanical movements

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