Congreve Rolling Ball Clock, Dent, London, 1973, a replica of the clock patented by Sir William Congreve in 1808, the brass spring-powered movement is regulated by a rolling steel ball traversing an inclined plane in 15 seconds, tripping a lever, tilting the plane in the opposite direction, while registering 15 second intervals on the object left dial, minutes on the center and hours on the right, inscribed on the back plate Andrew Fell-Del., 1973, Ser. No. 132 and Dent on a silvered plate on the front, on a marble base and enclosed in a glass case, ht. 17 1/2, wd. 19, dp. 14 1/2 in.
Running condition, lacking one brass corner frame on glass cover.