The telephone system of the British post office. A practical handbook (1901)
Herbert, Thomas Ernest · London, New York, Whittaker and Co. · leaf 201
e peg is removed atthe Post Office the lamp may be lighted. This system throws upon the Post Office operatgr tbe responsibiUtjr q(getting connections cleare4. i85 Trunk Engaged Test at the Post Office. It will be observed that the third wire passes from the top contacts of theeight-point… … FiGDRE 143. multiple board. Hence it is possible to get a subscriber connected tomore than one junction. For instance, a subscriber who is speaking, say,to London from Manchester would not appreciate having half or oneminute of his three minutes wasted by an explanation with a second
Telephone · Postal service
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