. The telephone system of the British post office. A practical handbook . 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 littlepyramids, as shown in elevation in Figure 21. Further, the spacebetween them is f

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. The telephone system of the British post office. A practical handbook . 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 littlepyramids, as shown in elevation in Figure 21. Further, the spacebetween them is filled with granular carbon. It will be noticed thatthe ridges between one pyramid and the next fall opposite the centreof the pyramid above and below (Figure 21). This prevents thegranules from running from the top to the bottom along the ridges.

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Keywords: ., bookcentury1900, bookdecade1900, booksubjecttelepho, bookyear1901