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The telephone system of the British post office. A practical handbook (1901)

Herbert, Thomas Ernest · London, New York, Whittaker and Co. · leaf 66

An illustration from The telephone system of the British post office. A practical handbook, 1901, leaf 66 — disconnected and when the circuit iscomplete is very different, so that perhaps this indication might be deemedsufficient. This plan is adopted in connection with the call wire system inoperation at Manchester. Another plan for bringing about this short-circuiting of the armature isto place a disc… … Figure 41. angles to it and passing through this slot. The pin is held to one end ofthe slot. The other end of the slot is insulated with ebonite. On re-volving the crank the pin moves from the metal on to the ebonite at theother end of the slot, and then begins to rotate the armature. It will…

Telephone · Postal service

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