The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 102
N PRACTICAL USE 79 that instead of a platinum diaphragm one of thin pine woodwas employed, having fixed to its centre a thin block ofcarbon connected by a fine wire to one of the terminals. The Solid-Back.—This transmitter, invented by Mr A. C.White in America, has achieved great success owing to… … Fig. 69. —Scale % back view of the transmitter proper as made for attachmentto a moving arm. The small brass cell g is provided with ascrewed cover, which serves to clamp a small flexible micadisc, to the centre of which is clamped a thin carbon electroderather smaller than the inside of the brass…
Telephone
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