The telephone: an account of the phenomena of electricity, magnetism, and sound, as involved in its action (1877)
Dolbear, A[mos] E[merson], 1837- [from old catalog] · Boston, Lee & Shepard; New York, C. T. Dillingham · leaf 35
wire,and in the other a piece of iron is made a magnetwhile enclosed in a coil. In each case there isgenerated a current of electricity which lasts nolonger than the mechanical motion of the partslasts. 3° THE TELEPHONE. MAGNETO-ELECTRIC MACHINES. Such transient currents are practically useless,and… … FIG. 4. bent into a U form in order to utilize both poles.N and S are short rods of soft iron fastened intoa yoke-piece Y, also of soft iron. Coils of wiresurround each of the rods as represented, the endsof the wires connecting with each other and withwhat is called a pole-changer. The whole of…
Telephone
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