Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1903)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 214
%-]X^™?proportional to the current; that is, if one ampere, through a certain magnet requires aforce of 56 pounds to detach its keeper (see test below) when2 amperes are passed through it, twice the force, or 112pounds, is not required, but usually much less. To make atest of the effect of… … 196 PRACTICAL ELECTRICITY. noted till the detachment of the keeper takes place. A testmade in this manner upon a small soft iron core electro-magnet, wound with 500 turns, and a soft iron keeper gave thefollowing results when different current strengths were passedthrought it. Test of the…
Electricity · Magnetism
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