measuring instrument in which current or voltage is determined by the couple on a small coil pivoted between the poles of a magnet with curved poles, giving a radial magnetic field, mõõtevahend, mis määrab voolu või pinge väikesel mähisel pööratuna kumerate poolustega magneti pooluste vahel, moodustades radiaalse magnetvälja, instrument which operates by the interaction of the field of a movable permanent magnet with the magnetic field due to a current in a fixed coil