19th Century Watches
The 19th century saw many changes in the watch. By 1830 the cylinder escapement had almost completely replaced the verge escapement and the use of the chronometer escapement gave watches a precision they had not had before. The lever escapement established its supremacy in this century.
Possibly the most noticeable technical achievement was the [...]

18th Century Watches
The successful application of the balance spring to the 18th Century Watch in 1675, while overcoming one great problem, showed up another — the inefficiency of the verge escapement. The best accuracy attainable was about one minute a day depending on conditions.
Much experimentation both on the Continent and in England was carried out [...]