International Library of Technology · Scranton, International Textbook Co. · leaf 174
Fig. 988.many turns of wire, so as to make a very strong field at thecenter of the coil with a feeble current. The magneticsystem is made astatic, but the magnets that point in onedirection are hung considerably below those that point inthe opposite, and each set of magnets has its own coil;…
Electrical engineering
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