The telephone system of the British post office. A practical handbook (1901)
Herbert, Thomas Ernest · London, New York, Whittaker and Co. · leaf 77
thence through the bell to terminal 8, to the contact screw ofthe relay, and through the tongue back to the negative pole of thebattery. 6i Operating Connections. It will now be as well to consider the operators apparatus. Thespeaking apparatus consists of a Deckert transmitter and a watch… … Figure 51. vertical positions of granular transmitters It will be seen that theinstrument should be held on a level with the nose, the head being heldup. There is also a button placed upon the handle, arid this button servesto short-circuit the secondary of the induction coil, thus leaving…
Telephone · Postal service
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