American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 140
f intersection with the diagonal, will also bea measure of the magnitude of the force which that line represents; the line p b, itis understood, being, in length, equal to tlie side c a, of the parallelogram. In Fig.87 several such parallelograms are shown. The two forces now to be considered are… … io6 AMERICAN TELEGRAPHY. a coil, or ring of wire. The needle is assumed to be, normally, in the magnetic meri-dian ba, and in the plane of the coil. As it may be taken for granted that, in the space about the needle, the earthsmagnetic field does not vary in strength, that strength may be called i.…
Telegraph
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