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The use of an electrometer or galvanoscope for sensing magnetic field or electric fields are well known.
A galvanoscope is an instrument or apparatus, such as a magnetic needle, for detecting the presence and direction of electric currents, specially those of feeble intensity.
I soldered two wires to the edges of the enclosed sheet of iron, and connected them with a galvanoscope , but could not perceive any effect upon the needle.
An excellent experimenter, Poggendorff devised a number of measuring devices, including the galvanoscope and Poggendorff mirror.
The deflection mirrors 5 and 7 are galvanoscopic mirrors which are rotated through a certain angle in dependence on the value of an electric control voltage.
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