American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 151
Since the scale line may be said to correspond to a tangent of the angle of de-flection of the needle, it will be observed that the strength of current in the coil ofthe Thomson reflecting galvanometer will be proportional to the deflection of theneedle as indicated on the scale. This deflection is…
Telegraph
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