The telephone system of the British post office. A practical handbook (1901)
Herbert, Thomas Ernest · London, New York, Whittaker and Co. · leaf 105
ceedure is as follows:—Subscriber io5i rings up,dropping the indicator in connection with his line at the National Ex-change. The National operator inserts a peg into his switch-spring, andascertains the nature of the service required by throwing forward thespeaking key. If connection with a local… … fie liu^f, _ !C SubaoriDer, Figure 78. complete. If a trunk connection is required, the operator takes par-ticulars, removes the peg, and places it into the service wire switch-spring,and rings the Post Office, when the particulars are entered upon a numberedwhite ticket. When this subscribers turn…
Telephone · Postal service
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