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.

     Thomas Earnshaw (1749-1829) developed components to give rigidity and stability to the escapement.

     George Daniels (1926-) invented the coaxial escapement which needs no lubrication and is stable for long periods of time without servicing.