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.
The dial is signed "Earnshaw/London". The case is stamped with the Admiralty mark ( broad arrow below asterisk) on the hood door front, on case front, on both sides of trunk case door, and case backboard inside the trunk. The interior of the trunk door with four paper labels: (1) cleaning label by Dent, dated 1887 and 1896; (2) Royal Observatory Greenwich label, repaired 1899, November by Messrs Barnsdale & Co; (3) Clowes & Jauncey, Beauchamp Place; (4) modern label, Evans & Evans, Alresford, Hampshire. Label under plinth , restored cabinet work 1986/ A J Weston, Finches Lane, Twyford, Hampshire.