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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 283

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 283
at-tery melted down the springs of the pole-changers of several valuablemachmes, by connecting with a large trough battery when in operation Care should be taken to have the springs of this pole-changer press uponthe segments with just as much force as is necessary to make and cease theirbearmgs at… … What is said of wires conducting electric currents, and free to move?2i 278 CONTRACTING HELIX. Fig. 224.

Physics

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