#astatic_galvanometer__astaticgalvanometer  has a moving magnet and astatic coils arranged to cancel the effect of the Earth's magnetic field
  supertype:  galvanometer  meter for detecting or comparing or measuring small electric currents
  part:  astatic_coils__astaticcoil  an arrangement of coils used in sensitive electrical instruments; the coils are arranged to give zero resultant external magnetic field when a current passes through them and to have zero electromotive force induced in them by an external magnetic field

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