Spon, Ernest, Haldane, Robert, Lock, Charles G. Warnford (Charles George Warnford), 1853-1909 · London ; New York : E. & F.N. Spon · leaf 221
Electrics— Telephones. 19!) oft' the vulcanite v, and lets the ring 5 n allows the spring <j to make contact come in contact with contact 1 ; this with j. Contact is also at the same puts c in connection with one end of time made by the lever with e, and broken at/. This operation brings the… … this to /, then to d and c, and upwards The current now flows from No. 1 cell to one of the top parts, then out to bell, only, this being sufficient to work the which it rings in passing, ajid on to local circuit through the microphone. centre post p, and back through earth Its course is through…
Workshop recipes · Technology · Industrial arts
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
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