Tangent galvanometer
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“The galvanometer is an instrument for determining the strength of an electric current by means of the deflection of a magnetic needle around which the current flows. When a galvanoscope is provided with a scale so that the deflections of its needle may be measured, it becomes a galvanometer.” — Avery, 1895
Source
Elroy M. Avery School Physics (New York: Sheldon and Company, 1895) 525
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