Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 503
and well known magneto-induction machine, in which thebobbins, D, are placed on pole extensions of the magnets,C, and the variations in magnetic force are produced bythe wheel armature, E. Another method of generating currents by a rotary 48o EXPERIMENTAL SCIENCE. Fig. 468. … movement of the armature is to make the armature in theform of an electro-magnet, and mount it upon a rotatingspindle so that it may revolve in close proximity to thepoles of a strong permanent horseshoe magnet. This form of machine, which is the invention of Clarke, is shown in Fig. 467. It has…
Physics · Lantern projection · Electric apparatus and appliances
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