n. [ Galvanic + -meter: cf. F. galvanomètre. ] (Elec.) An instrument or apparatus for measuring the intensity of an electric current, usually by the deflection of a magnetic needle. [ 1913 Webster ]

Differential galvanometer. See under Differental, a. --
Sine galvanometer,
Cosine galvanometer,
Tangent galvanometer (Elec.), a galvanometer in which the sine, cosine, or tangent respectively, of the angle through which the needle is deflected, is proportional to the strength of the current passed through the instrument. [ 1913 Webster ]