Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 495
duced by the vibrations of four separate diaphragms. This form of telephone is shown in Fig. 7. The U-shaped steelmagnet is seen at A. The tubular soft iron core, D, is provided withhelices C, C, and diaphragms E, E^. The rod d^, intended to carrythe motion of the diaphragm nearest the mouth to the… … FiG. 8.—Grays Electro-magnetic Teleplione (section). ment consists of a handle, H, of iron or steel, furnished with a softiron core, C, connected by means of a screw, with one end of H inthe manner shown. This core is wrapped with a coil of wire of com-paratively low resistance that is included in…
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