Dated 1840. From Scientific apparatus, musical instruments and telegraph equipment, [1834-1875].

Electric clock designed by Wheatstone as one of a number of 'slaves' controlled by a master clock.  The dial movement is a synchronous motor, operating from the alternating current generated by the pendulum of the master at a rate of one cycle per second.  Alexander Bain (1810-1877), clockmaker and  inventor, disputed Wheatstone’s claim to have invented the electric clock [see K/PP107/1/1/57 & 78]. Housed in a mahogany case with gilt metal face inscribed 'C Wheatstone, Invenit'.