The elements of dynamic electricity and magnetism (1903)
Atkinson, Philip. [from old catalog] · New York, D. Van Nostrand company · leaf 89
ldinga straightened section of copper wire, connecting thepoles of a battery or cell, alternately above and belowa poised magnetic needle, and reversing the direction ofthe current in each position. The Galvanoscope.—A better instrument for this pur-pose is represented by Fig. 30, consisting of a… … minals at A and B^ and the upper wire, which is joinedB c to the under at the left and in-^ sulated from it at the point ofsupport on the right, has its ter-minal at C. Hence when thebattery wires are attached to Aand B the current flows underthe needle; when attached to Aand C, over the needle;…
Electricity · Magnetism
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