astatic galvanometer


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Noun1.astatic galvanometer - has a moving magnet and astatic coils arranged to cancel the effect of the Earth's magnetic field
astatic coils - 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
galvanometer - meter for detecting or comparing or measuring small electric currents