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John Arnold was the first to design a watch that was both practical and accurate. He brought the term "Chronometer" into use in its modern sense, meaning a precision timekeeper. His technical advances enabled the ‘mass’ production of Marine Chronometers for use on board ships beginning in 1782. With regard to his legacy one can say that both he and Abraham-Louis Breguet largely invented the modern mechanical watch. Certainly one of his most important inventions, the Overcoil balance spring is still to be found in most mechanical wrist watches to this day. From around 1770, Arnold continued the development of portable precision timekeepers almost from the point at which the development of John Harrison's precision timekeeper had ended. Compared to Harrison's watch, the basic design of Arnold's was very simple, both consistently accurate and mechanically reliable. Importantly, the relatively conventional design of the movement facilitated its production in quantity at a reasonable price, also at the same time enabling easier maintenance.
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