The telephone system of the British post office. A practical handbook (1901)
Herbert, Thomas Ernest · London, New York, Whittaker and Co. · leaf 49
fice. CHAPTER VI. Battery Telephone Stations. Having examined some of the leading types of transmitters andreceivers, it now becomes necessary to consider what arrangements willhave to be made in order that the instruments may be pat to practicaluses. First of all some means of calling attention to… … Figure 25. The trembler bell electrically consists of an electro-magnet, the circuitof which is completed through its armature. The electro-magnet MM(Figure 25), consisting of two coils, is fixed to a brass frame F, whichis in turn secured to the wooden base. To the top of the brass frame asteel…
Telephone · Postal service
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