The telephone system of the British post office. A practical handbook (1901)
Herbert, Thomas Ernest · London, New York, Whittaker and Co. · leaf 195
ones are teed to the line and come into contact with the two sidesof the peg, which is exactly similar to the peg described upon page 59but for the fact that the end near the handle is rounded so as to fit intothe circular opening of the switch-spring. The two outer or short-circuitsprings project… … Figure 140. In the case of trunk line operating in the Post Office multiple systemthe pairs of pegs and cords and apparatus by means of which the con-nections are made are of a very complicated nature. It is here necessaryto distinguish between the two pegs of each pair. The answering peg is,as…
Telephone · Postal service
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