The telephone system of the British post office. A practical handbook (1901)
Herbert, Thomas Ernest · London, New York, Whittaker and Co. · leaf 183
been dotted throughout to facilitatetracing. Thus it will be seen that by inserting a peg in any one of theswitch-springs the A and B lines are picked up by the tip and neck of thepeg. A bad connection between any one of the line and inner springsrenders speaking difiicult, but such faults are… … Figure 133.A connection between No. 17 and No. 1236 is shewn in skeleton inFigure 134. The connection is made at No. 17s request, Since a peg is % M r-if-
Telephone · Postal service
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