Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 360
perating telephone T,mounted in a wooden frame at an adjustable height approximatelyhalf wav between the bevel edges A and B. In practice, the height Sept., 1921.] Mechanical Frequexcy-Meter. 351 of this telephone T does not have to be varied, and, in any futuresimilar instrument, might be left… … of this telephone are removed. The metallic lip has a notch in itabove and below, to permit the poles to approach the wire closely.The magnet of the telephone might be removed from its frame,as in the King sonometer, but the usual composition case affords aconvenient mechanical protection. The…
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