PHILIP HARRIS GALVANOMETER WITH SCALE, 1950's

A mirror is hung on a gold thread between an electromagnet , the mirror moves according to current in the coil. A light is reflected of the mirror onto a distant scale amplifying the reading. Used for measuring small electrical currents by amplifying the movement of an armature with a mirror attached to it suspended between a coil. A light is shone onto the the mirror and reflected onto a scale some distance away. This model has a needle and scale also

A1547