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Long case clock by Thomas Earnshaw

Long case clock, astronomical regulator, sidereal time, metal / mahogany, Thomas Earnshaw, London, England, 1791 A precision astronomical regulator clock ( month going, sidereal time), in a flat-topped and bombe sided mahogany longcase of short stature. Dial: a 10 inch square silvered brass dial with inscribed markings and Arabic numerals coloured black, the large outer minutes ring enclosing two smaller dials - a seconds ring with five-second observation markers, and a 14-hours dial (signed "Earnshaw/ London"), each dial with a slender blue steel hand, the winder square is to right. Movement: a month going (30 day) five-pillar movement with shouldered plates, black-painted angle supports, five-wheel train, dead-beat escapement with jewelled pallets and jewelled pivot holes to the escapement, maintaining power and stop-work, the weight driven movement has a grooved drum with a brass-cased 7kg cylindrical weight suspended on a wire cable. Pendulum: a separately suspended Harrison's grid-iron pendulum, with a temperature compensated grid-iron shaft composed of nine parallel rods in brass and steel, a massive lenticular bob in brass, and a graduated regulation nut. (The pendulum is a post 1932 replica of the 1791 origional-fitted by Clowes & Jauncey to replace the c.1870 E Dent & Co zinc and steel cylindrical pendulum.) Case: a flat-topped longcase (of quite short stature) in mahogany veneers with a dark polished surface, the flat-topped hood has a moulded cornice and reeded canted corners edging a glazed square door, the sides are panelled, the hood slides forward for removal and is held in place by a wooden swivel catch inside the door, the trunk is straight at the top and swells to bombe sides (near the pendulum), the rectangular door at front has a glazed aperture near the lower edge, the clock is raised on a high panelled plinth (not original - post 1932) with reeded canted corners and bracket feet, there are five holes in the backboard with one at hood and one at lower trunk fitted with a threaded brass roundel. Accessories: with weight, pendulum (gid-iron rod, bob & adjuster), winder, and hood door key and trunk door key.

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(Accession num: 94/15/1)

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Tags

mahogany, grandfather, clock, antique, collectible, tall clock, Thomas Earnshaw, clock, mahogany, dial, time keeping, astronomical clock, English clockmakers, Earnshaw London, clock, furniture, wood, mahogany

Headline: Clocks on Voyage

Summary: This clock was used by Matthew Flinders on the HMS Investigator during the voyage in which he undertook a landmark circumnavigation of Australia (1801-1803).
Source: http://www.powerhousemuseum.com/collection/database/?irn=138867&utm_source=api&utm_medium=api&utm_campaign=0013b65664cc0df

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