Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1902)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 183
the case of the poisedneedle, and is also repelled orattracted by another magnetor solenoid, the polarity beingas explained for a single con-volution, ^ 172. 176. Rules for Deter-mining Polarity of a Sole-noid.—Clasp the solenoid,or helix, in the right handso that the fingers pointaround it in the… … Fig. 148.—Ampere Frame Stand with Coils. The movable coils are poised on needle points and the terminals dip in concentric mercury cups. current around the coil when theclasp the coil with the right hand, so that ELECTR0M4.GXETLSM. 165 OlRECTIOH OF^MAGNETIC FORCE Fig. 149.-
Electricity · Magnetism
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