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 282
bring the springs again in contact with the segments. By this means, the direction of the current through the wire,and, of course, the polarity of the bar, B, are twice changedduring each revolution. Thus the position of the two magnetsto each other is such, that, during the first quarter of the… … * The bearings on •which these electio-magnets revolve are delicate, and theinstrument, ■without proper care, may become easily injured and renderedinoperative. What does the Revolving Electro-Magnet illustrate? Describe the parts ofthis. State the direction of the flow of the galvanic current…
Physics
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