Although Harrison had
created an extremely accurate clock a number of changes and
improvements have made since 1765.
Thomas Mudge (1715-1794) invented a balance and spring
escapement in 1754 which came into common use in the 19th century.
John Arnold (1736-1799)
developed new forms of temperature compensation, new balances and
springs and new escapements, and trained his women to reproduce them
at modest prices, which made them available for use on merchant ships.
(1749-1829) developed components to give rigidity and stability to the
George Daniels (1926-)
invented the coaxial escapement which needs no lubrication and is
stable for long periods of time without servicing.