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 32
MAGNETIC INDUCTION. 27 permanent magnets. They are generally calledmagneto-electric machines. The action involvedin these machines is so important in its bearingupon telephony as to necessitate a fuller descrip-tion of them. MAGNETIC INDUCTION. Let N S, Fig. 3, be a bar of hardened steel ren-dered… … FIG- 3. brought near to it a board-nail, the latter willbecome a magnet through the inductive action ofthe first magnet. This induced magnetism maybe demonstrated by bringing a tack or other bit ofiron to the end that is farthest from the permanent 28 THE TELEPHONE. magnet; the tack will adhere to…
Telephone
Internet Archive · Prelinger Library · Public Domain Mark 1.0. Free to use for anything.
