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The elements of natural philosophy : copiously illustrated by familiar experiments and containing descriptions of instruments, with directions for using : designed for the use of schools and academies (1856)

Sprague, A. W. (Alfred White), 1821-1891 · Boston : Phillips, Sampson & Company · leaf 266

An illustration from The elements of natural philosophy : copiously illustrated by familiar experiments and containing descriptions of instruments, with directions for using : designed for the use of schools and academies, 1856, leaf 266
ll magnet, closely wound with finecopper wire, may be rendered far more powerful than a larger bar loosely woundwith a coarse wire. The former magnets are used for telegraphs, shocking-machines, etc. Explain Fig. 211. Give the experiment. How may an electro-magnet ofgreat power be formed ? 260… … are attached whenever communication is made with the battery.This armature will be attracted to the magnet with a forcesufficient to support a surprising weight. 235. Electro-Magnetic Telegraph. — Among the wonderfultriumphs w^hich science and art have achieved within thepast few years, few hold so…

Physics

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