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Description: | 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.
AQN: Caird, James, Sir (owner).
caption: Pocket watch, case closed and gradually opening | Publisher: | "http://collections.rmg.co.uk/" | Rights holder: | "Royal Museums Greenwich" | Subjects: | pocket watches | Source: | Royal Museums Greenwich | Identifier: | http://collections.rmg.co.uk/collections... | Go to resource |
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