Spon, Ernest, Haldane, Robert, Lock, Charles G. Warnford (Charles George Warnford), 1853-1909 · London ; New York : E. & F.N. Spon · leaf 125
Electrics — Bells. 103 of metallic contact plates b, fixed at to the bottom of the case. As the block distances apart one below the other. so descends, the poles of the magnet are There are as many contact plates as wires carried past a series of other soft iron from the several rooms, and each… … wire through which the current pre- net come opposite viously passed, the current again passes, another armature, by means of which the armature, which is then opposite to the bell is to be rung, and an electric the poles of the magnet, is attracted, current being then caused to pass and the signal…
Workshop recipes · Technology · Industrial arts
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
