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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 65

An illustration from The telephone system of the British post office. A practical handbook, 1901, leaf 65 — >=S^ 1 ^ ♦ i-<vvvvyy ■^1 Figure 39. plete. It corresponds somewhat to the galvanometer which is used in thecase of telegraph circuits. If the wire is disconnected the bell at neitherstation rings. E 50 Bell-Blake Telephone Station. … Figure 40. Short-Civcuiting Arrangements. 5t There are some magneto-generators which are joined up so as to cut outthe magneto bell and ring direct on to line, but it is very questionablewhether this is altogether an advantage. The amount of force requiredto turn the handle when the wire is…

Telephone · Postal service

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