The telephone system of the British post office. A practical handbook (1901)
Herbert, Thomas Ernest · London, New York, Whittaker and Co. · leaf 84
e central springs of the springs operating Connections. 60 labelled direct. through the inner springs, through the reversedsprings, through the generator springs to the secondary coil and receiverof the operators telephone. The receiver is joined to an ordinary peg andis inserted as shown, and the… … Figure 58. to the inner left spring. The path of the primary circuit is from theright hand battery to the right hand long transmitter spring, through thetransmitter back to the other pole. When the transmitter and receiverare reversed the other batteiy is inserted. The pegs must be…
Telephone · Postal service
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