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AN EARLY 19TH CENTURY TWO-DAY MARINE CHRONOMETER

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AN EARLY 19TH CENTURY TWO-DAY MARINE CHRONOMETER
Parkinson & Frodsham, No. 909

the silvered dial signed and numbered Parkinson & Frodsham, 'Change Alley, LONDON 909, hour chapter with Roman numerals within outer minute chapter with five minute intermarkers, subsidiary seconds and up-and-down dials, blued steel hands, small size movement (54mm. diam.), within sprung drum dust cover, the top plate inscribed Parkinson & Frosdham, 'Change Alley, LONDON, Earnshaw escapement, cut bimetallic balance, segmental heat compensation weights, blued steel helical balance spring, convex glass, brass bowl with spring brass locking arm assembly, gimballed in plain three-tier mahogany box, external brass drop handles, trade label of MICHAEL RUPP & CO 39 SOUTH ST. COR. OLD SLIP. NEW YORK
86mm. dial diam., 160mm. sq. box

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The top plate has been drilled to take the 'gallows' type of stud for the top coil of the balance spring. In 909 the stud is attached to the balance cock.
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