Multimedia Gallery
- Innovations: Sea Clock
This chronometer movement was made by John Roger Arnold about 1825.
This chronometer movement was made by Thomas Earnshaw, about 1798.
Box chronometer, after Thomas Mudge, No. 14 made by Howells, Barraud, and Jamison, 1802.
This illustration from 1766 depicts the improved escapement in Le Roy’s marine clock.
Ferdinand Berthoud, a Swiss clockmaker serving the king of France, produced many marine clocks.
Portrait of John Harrison by James King, about 1766.
Marine chronometers are precise, specialized clocks for finding longitude at sea. They serve as portable time standards.
Chronometers like this one by Arnold & Dent were used on the U.S. Exploring Expedition (1838-1842).
Chronometers like this one by Charles Frodsham were used on the U.S. Exploring Expedition (1838-1842).
Chronometers like this one by Molyneaux & Son were used on the U.S. Exploring Expedition (1838-1842).
