The telephone system of the British post office. A practical handbook (1901)
Herbert, Thomas Ernest · London, New York, Whittaker and Co. · leaf 70
t moisture is condensed upon it,and when the telephone is much used most unpleasant odours arepresent. The transmitter is of the ordinary Gower pattern. Its externalappearance is indicated in Figure 43. Connections. 55 The internal connections of the Post Office telephone are shown inFigure 44. The… … Figure 44. In this instrument two Bell receivers are shown joined up in parallel.The induction coil is fitted beneath the case, and formerly had a resist-ance of s and 150 respectively for primary and secondary. A coilhaving from 9 to 12m and 25 is now used. The instrument is fitted with eight…
Telephone · Postal service
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