English Congreve Rolling Ball Clock
The gilt medal works with a Roman and Arabic numeral dial, inscribed RWS, England, No Jewels.
Within a glass and mirrored case.
Clock: 9 1/2in (24cm) h. 8in (21cm) w. 8in (21cm) d.
Case: 14 1/2in (37cm) h. 10 1/2in (27cm)w. 9 12in (24cm) d

Invented by Sir William Congreve in 1808. The ball takes between 15 seconds and one minute to run down the zigzag track, where it trips the escapement which in turn reverses the tilt of the tray and at the same time causes the hands of the clock to move forward.
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