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 184
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.- … the thumb outstretched at right angles will point toward theN-pole^ then the fingers will point in the direction of the cur-rent. If on viewing theend of a solenoid thecurrent flows aroundthat end, in the samedirection that thehands of a watchmove, Fig 150, thatend is S-polarity. Ifthe current…
Electricity · Magnetism
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