Dated 1834-1837. From Scientific apparatus, musical instruments and telegraph equipment, [1834-1875].

Apparatus to demonstrate the rotary action of a magnet, an electromagnetic motor or galvanometer.   Consists of a U-shaped magnet on a wooden base with a mercury trough, wire coil contact and a small iron bar magnet.  Possibly used by Wheatstone for teaching.  [See K/PP107/5/103.]