Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 496
otted tube of soft iron. The coilof wire wrapped thereon is made of a much higher resistance than thecoil in the first magnet. A stiiF spring-plate, B, of iron or steel is Dec, 1884.] Glimpses of the Electrical Exhibition. 471 secured at one end to the handle, H, and at the other end is… … Fig. 9.—Grays Elcctro-mugnetic Telephone (elevation). opposite poles of the magnet are brought into close proximity witheach other, and their magnetic effects greatly increased. The idea of thus connecting the diaphragm with the opposite pole of the magnet has been employed in a number of different…
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