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 284
What is said of wires conducting electric currents, and free to move?2i 278 CONTRACTING HELIX. Fig. 224. … The Contracting Helix^ Fig. 224, will serve to illustratethe attractive power of elec-tric currents, moving in thesame direction. A wire loose-ly coiled is supported in avertical position at its upperextremity, on the top of abrass pillar which connectswith one of the screw-cups,while its lower end…
Physics
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