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| Index No. N8402 | Early Pocket Chronometer by Arnold |
| A late 18th Century English pocket chronometer by John Arnold in a silver consular case. Full plate gilt keywind fusee movement . Harrison's maintaining power. Engraved cock, pierced and engraved triangular table, garnet endstone. "O Z" type Arnold balance, three arm polished steel centre with two bimetallic compensation arms, circular adjustment nuts at their ends. Freesprung blue steel helical hairspring. Arnold type spring detent chronometer escapement, the detent set in a slot in the plate, escape pivots with endstones. Later white enamel dial with subsidiary seconds, Roman numerals, blue steel seconds hand, gold hands. Substantial plain silver consular case well made in the style of the original, maker's mark "MRM" in a rectangle. | ||
| Signed | Jn Arnold London Inv et Fecit No 25/326 | |
| Circa | 1783 | |
| Diameter | 52 mm | ||
| Depth | 15 mm |
| Good examples of early Arnold chronometers with OZ balances have become very difficult to find. This one is illustrated in John Arnold and Son by Vaudrey Mercer, plate 106 and listed as being "In its original state". It was used on H.M.S. Isabella by Captain Ross in 1818-19 on an Arctic expedition to find the North West Passage. It was placed at the disposal of the expedition by Mr. Henry Brown. The case was made in recent years by Martin Matthews closely following the design of consular cases found on Arnold chronometers of the period. |
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