Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 314
o E, throughthe inner coil back to the upper half of E, on by G to K, from chap, v.] Electro- Magnetism and Dynamics. 295 Z through the outer coils to L, and from L back by a binding-screw to the battery. 193. The Electric Bell.—The next useful applicationof electro-magnetism is shown in the… … Pio. 192. the clapper (J?) is moved by the electro-magnet (0). The clapperis held by a spring, which has a piece of soft iron (D) attachedto it, this piece of soft iron acting as the armature of theelectro-magnet.1 As soon as the current passes (in the direc-tion shown by the arrows), the…
Electricity
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten07unit-541-359.webp)