Practical electricity .. with questions and answers (1911)
Cleveland armature works, [from old catalog] comp, Lincoln, John C. [from old catalog] · [Cleveland, Ohio, Cleveland armature works] · leaf 53
ch the magnetic linesflow, or would revolve around the wire.. It is not possible,of course, to obtain a free north pole or a north pole with-out a south pole, so that all that can practically be discov-ered is the direction in which the north pole of a compassis moved. The direction in which the… … Figure 14 Magnetic spectum of wirecarrying current.
Electricity
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