Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 224
. Telephone. Arrange apparatus as shown in Fig. 257. The ironrod has a coil of fine insulated wire wound around one end of it, and in 216 MAGNETIC EFFECTS OF THE CURRENT front of this end is suspciuled a small soft-iron disc. A battery is placed in the circuitwith the coil, and thecircuit is… … Fio. 257.—Printii>le of the Telephone. The disc is seen to move to and fro. The movement iscaused by the varying strength of the current in the circuit.When the pressure is increased at the graphite, the resistanceis lessened and the current grows stronger and the electro-mao-net draws the disc…
Physics
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