The telephone system of the British post office. A practical handbook (1901)
Herbert, Thomas Ernest · London, New York, Whittaker and Co. · leaf 99
f the currentis from the positive pole of No. 2 battery (joined to tags 62 and 63) throughthe primary of the induction coil to the outer transmitter springs of thespeaking keys, thence, if a key be down, to the inner spring through shortspring of Tj, through the ball of the peg, through the… … speaking Battery Circuit. 85 of the peg, through the receiver to the shoulder of the peg, to the longreceiver spring, thence to the front receiver stud oi thespeaking key,through the front receiver spring to the tip of the pair of pegs, throughthe line connected to the peg to its shoulder, thence…
Telephone · Postal service
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