The telephone system of the British post office. A practical handbook (1901)
Herbert, Thomas Ernest · London, New York, Whittaker and Co. · leaf 46
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 littlepyramids, as shown in elevation in Figure 21. Further, the spacebetween them is filled with granular carbon. It will be… … Figure 22. The cones keep the granules well distributed, and thus uniformity ofcontact is secured. In order to prevent the trouble which arises fromthe granules becoming packed at the bottom of the cones, the diaphragmis fitted with a woollen ring F F, so that only the granules in the centreof the…
Telephone · Postal service
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