American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 141
A B, and the strength, that is, the magnitude, i, may also be indicated by th^same line. The strength of the magnetic field of a coil, however, in the space aboutthe needle, may be varied as desired, but we may begin by calling it i also. Astlie force of that field is exerted at right angles to A… … 3JO resultant of the two forces, each having a strength of i, will then be representedby the diagonal a d, and, since this diagonal represents, in direction and magnitude,the resultant of the two forces a b, ac, a needle acted upon by two such forces would bedeflected to a position, or an…
Telegraph
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