American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 142
th,to an angle, or degree, where a line continued therefrom would touch the line b d, at2, would have a strength of 2; and that a magnetic force due to the coil of 2\,similarly acting against the magnetic force of the earth, would deflect the needle toan angle where the diagonal E would touch the… … what has been said, that the length of the lineBD, reckoned from b, Fig. 87, tothe point where it may be touched by a diagonal, or resultant line, \% directly pro-portional to the strength of the coils magnetic force. Further, as the magnetic force,or field, of a coil, surrounded by air, is…
Telegraph
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