Small, Sidney Aylmer, 1876- [from old catalog] · Chicago, F. J. Drake & co · leaf 267
and if they are placed side by side,the lines of force will join and pass around all the wires,as shown in the diagram. In these diagrams the lines 268 ELEMENTARY ELECTRICITY of force are shown as curving in and out, between thewires, but as a matter of fact they would pass along instraight lines… … Fig. 133. If the current flowing in each one of the wiresD D D D is equal in strength to the current flowingin the wires A A, then it is self-evident that the numbercf lines of force—that is, the strength of the magnetismaround each of the D wires—will be the same as thataround each one of the A…
Electricity
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