American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 151
have started from zero, as may be seen by an examination of Fig. 100. Therefore, ifas, perhaps, is more frequently than otherwise the case in practice, the deflections donot exceed 50 or 100 divisions of the scale, it would be equal to working with deflec-tions of 1° or 2° on an ordinary tangent…
Telegraph
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