English brass two day marine chronometer in box Circa 1875

Brass chronometer in mahogany box
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An English brass two day going marine chronometer, made by Parkinson & Frodsham in London, circa 1875. Brass bound corners, external drop handles, glazed top, the upper section with signature plaque, gimbaled brass bowl with locking slide. Silvered dial with radial Roman numerals, outer minute track with Arabic five minute numerals, subsidiary seconds and blued steel hands. A full plate movement, pillars, brass, fusee and chain, Earnshaw type spring detent escapement, compensated bimetallic balance, free sprung cylindrical hairspring. Signature on the dial and case.
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Dimensions: 150 x 150 x 165 mm
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Signed: Parkinson & Frodsham, London
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Accompanied by the original mahogany box and ratchet winding key.
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Charles Frodsham (1810-1871). Was the most celebrated of the Frodsham family, with its numerous watchmakers, and was a prominent maker of very high grade chronometers and watches. For the 1851 exhibition, they introduced a three-quarter plate calibre which they marked AD.FMSZ, which continued subsequently to be put on all their highest grade work. In 1868 he devised a form of electrical contact for taking signals for chronometers. The company he founded continued after his death. Reverse Fusee: An arrangement whereby the conventional positioning of the barrel and fusee is reversed. Hence, the fusee chain crosses over between the barrel and fusee, near the centre wheel pinion, reducing the friction on the arbour bearings.