Lessons in practical electricity; principles, experiments, and arithmetical problems; over four hundred illustrations; an elementary text book (1909)
Swoope, C. Walton (Coates Walton), d. 1901 · New York, D. Van Nostrand company · leaf 187
Battery Fig. 152.—Simple Galvanometer. instrument is connected in acircuit the presence of the current is shown by the deflectionof the needle. The direction of the current is shown by the 167 168 PRACTICAL ELECTRICITY. … Fig. 153.—Students DetectorGalvanometer. side towards which the N-pole of the needle moves, ^[ 168.The strength of current is indicated by the amount of theneedles deflection; since the position the needle takes updepends upon the relative magnitude of the magnetic forces, due to the current and…
Electricity · Magnetism
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