#galvanometer  meter for detecting or comparing or measuring small electric currents
  supertype:  meter.measuring_instrument  any of various measuring instruments for measuring a quantity
  subtype:  astatic_galvanometer__astaticgalvanometer  has a moving magnet and astatic coils arranged to cancel the effect of the Earth's magnetic field
  subtype:  moving-coil_galvanometer  a galvanometer that is operated by the force exerted by an electric current flowing in a movable coil suspended in a magnetic field
     subtype:  ballistic_galvanometer__ballisticgalvanometer  a moving-coil galvanometer that measures electric charge

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