Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 483
the Eleclrical Exhibition. [Jour. Frank.Inst., The induction coil, I, is connected with the battery, B, as shown.The transmitter, T, is placed in the circuit of the battery and the prim-ary wire of the induction coil. The receiver, R, is connected, as shown,to the terminals of the secondary coil of… … Fig. 7.—Dolbear Electro-Static Telephone System. From the preceding description it will appear that the electro-statictelephone of Dolbear forms a species of instrument quite distinct fromother telephones. Although it follows Keis, in that it employs thevoice of the speaker to vary the amount of…
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