The telephone system of the British post office. A practical handbook (1901)
Herbert, Thomas Ernest · London, New York, Whittaker and Co. · leaf 38
ost Officefor the use of linemen is of the watch pattern. The instrument is used bythe linemen to speak from a pole to the Telephone Exchange, so as to Watch Receiver. 23 locate faults with certainty where there is no intermediate test-box.A watch receiver is shown in Figure 14. The magnet consists… … Figure 14. The instrument is very efl5cient, and is frequently provided with an ovalring fixed at right angles to the back of the case, thus making it some-what resemble an Ader receiver. In some forms of this instrument asiir excitateur is also added. 24 The Telephone System of the British Post…
Telephone · Postal service
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