Description

This type of galvanometer has a movable metal coil with an attached mirror suspended between the poles of a magnet. When a current passes through the instrument, it passes through the coil that suspends the mirror, twisting it in proportion to the interaction of the current running through the coil and the magnetic field generated by the magnet. When a light is shined on the mirror, the twisting causes the reflected light to move. The position of that reflected light on a graduated scale indicates the current running through the instrument.

Catalog number 3411, Serial No. 6551