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| View Original: | British Museum Marine Chronometer.jpg (1512x2496) | |||
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| Keywords: British Museum Marine Chronometer.jpg en Marine chronometer made by Thomas Earnshaw Senior that was used on the HMS Beagle BabelStone own Museum British Museum credit line 2010-06-24 Details Marine chronometer Rectangular mahogany box lined with green beize with brass carrying handles at the sides Hinged lid with glazed viewing aperture and sliding mahogany cover A key-operated lock at the front There is an inserted plain ivory disc in the lid front Silvered brass dial with Roman hours I-XII within a minutes circle Subsidiary seconds dial above VI Plain blued-steel hour minute and seconds hands Movement contained in a lacquered brass bowl One-day spring-driven movement with fusee and Harrison's maintaining power Jewelled bearings for train wheels in screwed settings Earnshaw spring-detent escapement with Earshaw split-bimetallic temperature compensation balance and free-sprung helical blued-steel balance spring Height 17 6 cm in on Width 20 8 cm in on Depth 20 8 cm in on Room 39 case 10 derivative works British Museum Marine Chronometer cropped jpg cc-zero Marine chronometers Room 38-39 British Museum Thomas Earnshaw | ||||
