The telephone system of the British post office. A practical handbook (1901)
Herbert, Thomas Ernest · London, New York, Whittaker and Co. · leaf 34
Figure g. The ring answers precisely the same purpose without affecting the flexibilityof the diaphragm, amd to this may be traced its greater efficiency. Themagnet is usually nickel-plated, and thus presents a very good appearance. … Figure io. Figure 9 shows the external appearance of the Ader receiver made bythe Consolidated Telephone Company. 20 Gower Receiver, Another most successful modification of the Bell telephone is the Gowerreceiver. It consists of a large semi-circular magnet, NS (Figure lo), thepoles of which…
Telephone · Postal service
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