Details
AN AMERICAN TWO-DAY MARINE CHRONOMETER
T.S. & J.D. Negus, No. 1510, circa 1875
The silvered dial signed and numbered T.S. & J.D. NEGUS New York. No. 1510, Roman hour numerals, outer chapters with five minute intermarkers, gold hour, minute and up-and-down hands, subsidiary seconds dial with blued steel hand, Earnshaw escapement, cut bimetallic balance, circular heat compensation weights, blued steel helical balance spring, spring foot detent with jewelled locking stone, electrical one-second, make/break contact assembly fitted to fourth wheel, brass bowl and gimbal in later plain three-tier light mahogany box with external brass drop handles, later key (numbered 550)
100 mm. dial diam., 192 mm. sq. box
