American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 144
, attract each other, and, when like, repel eachother; the attraction and repulsion being due to the tendency of the lines to coin-cide in direction; this very tendency in the case of like poles, as stated, apparentlyproducing repulsion. When a wire carrying a current is formed into a ring, or… … dicated as in Fig. 92. In that figure c care sections of a circular coil of wire takenat diametricall}^ opposite points. The space within the dotted lines / may represent FIG. 92,
Telegraph
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