Spon, Ernest, Haldane, Robert, Lock, Charles G. Warnford (Charles George Warnford), 1853-1909 · London ; New York : E. & F.N. Spon · leaf 117
ht-hand switch, a current of electricity is sent through wire to J^ the other end, through No. 1 knob to electro-magnet in relay, which draws down the spring until it touches the J 5 ^ other wire, which sends a current through the battery, and strikes the (G) The subjoined arrangement (Fig. bell.… … house, permanently connected with gas- plains its construction. Instead of pipe /, and so placed that when at rest having a contact-breaker fixed at a, the tliey are in contact with the plates. circuit only goes through the magnet, (7) Fig. 50 shows another solution of thus only ringing when the…
Workshop recipes · Technology · Industrial arts
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
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