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 179
, ^[ 170, and it will confirm theposition the needles take up at any point. On one side of theloop all the whirls enter it in the same direction, and emergefrom the opposite side as is further shown in Fig. 140. 172. Magnetic Field at the Centre of a Circular Cur-rent.—If a magnetic body, A, Fig.… … -Graphical FieldCurrent.Made with the aid of iron Circular lings. ELECTROMA GNETISM. 161
Electricity · Magnetism
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