The telephone system of the British post office. A practical handbook (1901)
Herbert, Thomas Ernest · London, New York, Whittaker and Co. · leaf 110
igure 82). It consists of anelectro-magnet with long flat steel armature, with a contact breakersimilar to that of an electric bell. The steel reed is connected toone line, and the centre of the two sets of the batteries is connectedto the other side of the ringing keys. Thus it will be seen that… … /?<.. <!■«/.</.-r«4 3»..«. K..O Figure 82 order that the current may not be of too short duration. The reed isdriven by a separate two five-cell Daniells joined in parallel. Across thewhole arrangement a condenser of small capacity is inserted in order toslow down the rate at which the…
Telephone · Postal service
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