細節
AN EARLY VICTORIAN EIGHT-DAY MARINE CHRONOMETER
Parkinson & Frodsham, No. 1907, circa 1835
The 24-hour silvered dial signed and numbered Parkinson & Frodsham. Change Alley, LONDON 1907, Arabic hour numerals 0-23, within outer minute chapters with Arabic five minute intermarkers, Breguet blued steel hour and minute hands, subsidiary seconds and up-and-down dials with blued steel hands, main-frame assembly carrying reversed fusee, barrel and centre wheel, the top plate inscribed Parkinson & Frodsham. Change Alley, LONDON, sub-frame assembly with chain guard carrying remainder of train and Earnshaw escapement, cut bimetallic balance with segmental heat compensation weights, blued steel helical balance spring with the top coil pinned to separate 'gallows' stud, spring foot detent with jewelled locking stone, brass bowl, the top with three positioning screws to accommodate holes in the dial and each having an associated sprung brass pressure spring, brass bowl with sprung brass locking arm assembly, gimballed in later brass-bound three-tier mahogany box with flush recessed brass handles
98 mm. dial diam.
