The telephone system of the British post office. A practical handbook (1901)
Herbert, Thomas Ernest · London, New York, Whittaker and Co. · leaf 45
FiGnRE 20 adopted by the Post Office, for whom it is manufactured by the GeneralElectric Company. The object of all the improvements which have been … Figure 21. made from time to time upon the original Hunnings transmitter hasbeen to eliminate the packing difficulty. The Deckert transmittershown in section in Figure 20 consists of a carbon diaphragm M Deckert Transmitter. 31 and a. backplate of carbon K, which is cut into the shape of…
Telephone · Postal service
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