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16 March 2026
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Dent, London, England, "Congreve Rolling Ball Clock", 8 day, spring driven, fusee movement with maintaining power is regulated by a rolling steel ball traversing an inclined plane every 15 seconds, tripping a lever, tilting the plane in the opposite direc
this clock, one of a limited edition of 150 reproduced by Dent in the 1970's, is a replica of the original patented by Sir William Congreve in 1808. I...