Gage, Alfred P. (Alfred Payson), 1836-1903 · Boston, London, Ginn · leaf 503
■BATTE8V Pig. 379. … Fig. 380. idea of the strength of the current is obtained. The magneticneedle is inside the box, that outside being merely an indicatorattached to the same pivot. 448. (3) Magnetising effect of an electric current. Electro-magnets. Experiment 8. — a. Wind an insulated copper wire in the form of…
Physics
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