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Description: | A marine chronometer numbered 462, by McLachlan. It has an eight-day double-frame fusee movement with three pillars, all fixed with blued screws. The movement is marked with the broad arrow. The fusee, with stop-work and Harrison's maintaining power, has a pipe round the winding square. There is an Earnshaw-type spring detent escapement and a two-arm balance with a blued helical balance spring.
The movement is mounted in a three-tier brass-bound mahogany box with a push-catch for the lid and a lock for the upper half. The upper half has a strut limiting opening to 90�. On the front of the upper half is screwed a rectangular tablet inscribed ?McLACHLAN / 462 / 8 DAY? and the broad arrow. The box fittings are standard, with brass drop handles on the sides, brass gimbals and a ratchet-winding key. The bowl has a brass balancing weight on the inside. The push-catch and lock are surrounded by shaped brass inserts. There is a cushion-shaped brass insert on the box lid. The underside of the box is covered with green baize. Inside the lid is a brass label-holder containing a rectangular card label and a circular paper label printed ?Issued from / H.M. Chronometer / Dep�t, / Bradford-on-Avon. / 15 OCT 1943?.
A silvered-brass dial has Roman numerals and a large seconds dial has Arabic ten-second figures with straight batons at alternate five-second intervals. The dial is inscribed in the centre ?McLachlan. London. No 462.? In the seconds dial is the broad arrow. The up-and-down dial, below XII, is marked with Arabic numerals zero to seven. It is marked 'UP' above zero and 'WIND' above seven. The chronometer is in good condition.
A typical eight-day marine chronometer of the mid-19th century. This type of machine was later largely withdrawn from UK Royal Navy ships in favour of the more accurate two-day version. The maker of this chronometer was probably Hugh McLachlan of Upper Street, Smithfield, London.
caption: Marine chronometer in case
caption: Marine chronometer (F1190 cut-out)
caption: F1191 cut-out
caption: Marine chronometer, movement | Publisher: | "http://collections.rmg.co.uk/" | Rights holder: | "Royal Museums Greenwich" | Subjects: | Horology Marine chronometer | Source: | Royal Museums Greenwich | Identifier: | http://collections.rmg.co.uk/collections... | Go to resource |
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