Source : Webster's Revised Unabridged Dictionary (1913)

Galvanometer \Gal`va*nom"e*ter\, n. [Galvanic + -meter: cf. F.
   galvanom[`e]tre.] (Elec.)
   An instrument or apparatus for measuring the intensity of an
   electric current, usually by the deflection of a magnetic
   needle.

   {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.