19TH CENTURY
細節
a two-day marine chronometer
19th Century
With unrecorded form of Earnshaw spring detent, not numbered, the silvered dial signed Reid, Bull Alley, Lombard Street, London. Two Day's Marine Chronometer with Roman hour numerals, subsidiary seconds dial (with replacement blued-steel hand), gold hour and minute hands, matt-gilt finish frame numbered 12, Earnshaw escapement, cut bi-metallic balance with underslung segmental heat compensation weights, polished white metal helical balance spring, inverted spring foot detent with jewelled locking stone mounted in 'keyhole' recess in top plate, the steady pin at outer end of detent projecting into a rotatable can for adjusting the 'lights' of the detent, brass bowl and gimbal, brass-bound three-tier mahogany box, numbered 4922, within the top lid a trade label with F. Smith & Son, Practical Chronometer Makers, Southampton, external brass drop handles
dial 8.8cm. diam.; box 15cm. square
19th Century
With unrecorded form of Earnshaw spring detent, not numbered, the silvered dial signed Reid, Bull Alley, Lombard Street, London. Two Day's Marine Chronometer with Roman hour numerals, subsidiary seconds dial (with replacement blued-steel hand), gold hour and minute hands, matt-gilt finish frame numbered 12, Earnshaw escapement, cut bi-metallic balance with underslung segmental heat compensation weights, polished white metal helical balance spring, inverted spring foot detent with jewelled locking stone mounted in 'keyhole' recess in top plate, the steady pin at outer end of detent projecting into a rotatable can for adjusting the 'lights' of the detent, brass bowl and gimbal, brass-bound three-tier mahogany box, numbered 4922, within the top lid a trade label with F. Smith & Son, Practical Chronometer Makers, Southampton, external brass drop handles
dial 8.8cm. diam.; box 15cm. square