Marine chronometer. A cylindrical brass body on four bell feet. Folding carry-handle on top. Brass case with steel clockwork. Glass cover on face. Face paint over brass. Hour, minute and second hands. Deeply recessed back.
CH classification HOROLOGY Chronometers chronometer
Earnshaw, Thomas (b.1749, d.1829)
L96 x W79 x H75 mm
Brass, glass, steel
Thomas Earnshaw \ INVT ET PECIT \ No 740
History and use
Thomas Earnshaw (1749 - 1829) was an English watchmaker who is known for his improvements to the process of marine chronometer production. Most notably, he invented a chronometer escapement in the mid 1780s. An escapement drives the timekeeping element, usually a pendulum or balance wheel, in a clock or watch. During the 19th century this escapement became the standard for marine chronometers and continued to be manufactured for use at sea until the advent of quartz controlled timekeepers. This marine chronometer was made by Thomas Earnshaw during this period of innovation (late 1700s).