Inside Out Library · Explore

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 117

An illustration from The telephone: an account of the phenomena of electricity, magnetism, and sound, as involved in its action, 1877, leaf 117 — of this membrane a piece ofiron, N S, Fig. 13, was glued. In front of thispiece of iron an electro-magnet M is so situatedthat its poles are opposite to it, but not quite touch-ing it One of the terminal wires of the electro- 112 THE TELEPHONE. magnet goes to the battery B; the other goes to… … FIG. 13* P, is a rather loose, thin disk of iron, which acts asan armature to the electro-magnet below it. Supposing that all the parts are thus properlyconnected, the current of electricity from the bat-tery makes both M and R magnetic; the elec- FIRST SPEAKING- TELEPHONE. 113 tro-magnet M will…

Telephone

Internet Archive · Prelinger Library · Public Domain Mark 1.0. Free to use for anything.

More pictures from The telephone: an account of the phenomena of electricity, magnetism, and sound, as involved in its action

More like this