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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 123

An illustration from The telephone system of the British post office. A practical handbook, 1901, leaf 123 — ination keys, the object of whichis to enable the transfer operator to speak and signal upon any circuit.The loop of each circuit terminates in a peg, and upon this circuit thereis absolutely no apparatus. These pegs are to be seen above the desk.Each A circuit is provided with a peg, a visual… … Figure 93. Combination Key. 109 The insertion of a peg at the section drops the visuals at the sectionand transfer board. The operator depresses the combination key, thusconnecting up her telephone. Having ascertained the nature of theservice, the corresponding peg is taken up and inserted into a…

Telephone · Postal service

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