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 263
more than the passage of theelectric current on only one side of this ; so, by increasing thenumber of the turns of the conducting wire, the power of thecurrent, in inducing magnetic properties in the iron, will beproportion ably increased. Experiment. — Let an insulated copper wire, loosely… … as seen in Fig. 208, be made the conducting medium of agalvanic fio^y, and place ^vitliinit a rod of soft iron. This rodwill become instantly magneticso soon as connection is madewith the battery, having anorth and south polarity, likea common magnet. Such is termed an Electro-Magnet. 231. Soft…
Physics
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