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5285
Centre-seconds stop-watch with cylinder escapement, in A silver pair-case. The watch is signed 'Geo. Graham London' on the potence plate and cap and inscribed 'W.S.5285' on the outer case.
This stop-watch is believed to have been made for James Bradley, the third Astronomer Royal, who used it for observations on the aberration of light and the fixed stars. The centre-seconds hand can be stopped by moving a small lever which protrudes through the side of the inner case. This actuates a spring which bears on the balance and thus stops the watch.
This stop-watch is believed to have been made for James Bradley, the third Astronomer Royal, who used it for observations on the aberration of light and the fixed stars. The centre-seconds hand can be stopped by moving a small lever which protrudes through the side of the inner case. This actuates a spring which bears on the balance and thus stops the watch.
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Object Details
| ID: | ZAA0009 |
|---|---|
| Collection: | Timekeeping |
| Type: | Stop-watch |
| Display location: | Display - ROG |
| Creator: | Graham, George |
| Date made: | circa 1729; ca.1743 |
| Exhibition: | Time and Longitude |
| Credit: | National Maritime Museum, Greenwich, London, Caird Collection |
| Measurements: | Overall: 65 x 52 x 27 mm |
| Parts: | 5285 |
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