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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 163

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 163
What is said in regard to soft iron and hardened steel ? Why are electro-magnets made of soft iron ? Of what are Artificial Magnets made, and whyusivilly made in the form seen in Fig. 125 ? What is the armature ? What is aMagnetic Battery ? 14 158 MAGNETISM OF THE EARTH. of the bar on one of the…

Physics

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