The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 92
thereis a thickness of diaphragm which gives a maximum effect.The stronger the magnet the thicker should be the dia-phragm. 2. The thickness of diaphragm being known for a certainmagnetic field, there is one diameter for the diaphragm whichgives the best result. This diameter will be greater… … Fig. 57.—Scale f 70 PRACTICAL TELEPHONE HANDBOOK of the coil, and in which these vary most with any movementof the diaphragm. From the above researches, M. Mercadier was led to devisea very small and light receiver, which he called the bitele-phone, and which he claimed to be as effective as the…
Telephone
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