Important English silver Arnold pocket chronometer Circa 1818

Silver chronometer with ‘right angle compensation’ by Arnold
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An important English open faced pocket chronometer, Hallmarked London 1818. Typical Arnold plain silver case, hinged on both sides, à goutte, maker’s mark TH for Thomas Hardy, Arnold spring detent chronometer with extremely rare adjusting device ‘right angle compensation’, engraved cock, steel balance. White enamel dial with Roman numerals and gold hands. Comes with three part mahogany box. Case and movement with matching number, dial and movement signed and numbered.
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Diameter: 58 mm
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Weight: 150 g
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Signed: Jn. R. Arnold
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It is very difficult to find an unconverted Arnold chronometer with this rare movement. The experts in Geneva wrote about this watch: “It is rare to find an unconverted Arnold escapement, it is even rarer to find one with such unusual compensation. In a regular compensation curb all parts are made fixed and are installed as such, they cannot be adjusted, and they either work correctly or do not. In this piece, the compensation can be adjusted by changing the point at which it acts on the regulator pin: the closer to the center, the greater the compensation, the farther away, the lesser the compensation. It seems that the present compensation was Arnold’s answer to Earnshaw’s sugar tong compensation”.