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 265
aining a weight of more than a hundredpounds. After breaking the flowof the current, they adhereslightly, but, lose entirely theirmagnetism when once separated.234. An electro-magnet of great power maybe made, by bending a round bar of soft iron,ns shown in Fig. 212, and winding the armswith two or… … Fig. 212.
Physics
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