A very fine art deco Mantel Clock by Bulle, numbered 1957, dating the clock to the second year of the company’s production in 1921. Housed in a very attractive lacquered mahogany case with a push button mechanism to open the front. With a silvered dial and exposed movement and two panels of beveled glass, the dial signed Bulle Patent and retailed by J.C. Bell Doncaster.Powered by a battery the pendulum swings along a bar magnet which has a north seeking pole at the centre and south poles at each end. As the pendulum swings contacts contacts close at every alternate swing and the pendulum is energised and attracted to the centre of the magnet bar. As the solenoid in the pendulum swings over the magnet a current is induced in it in opposition to that of the cell, thus the pendulum swings faster in response to the impulses it receives, the impulses are reduced in strength by the action of the induced current acting in opposition. Motion to the dial is supplied by a pawl and ratchet me...