"Edward Massey, an avid and energetic inventor, patented his form of lever escapement in April 1812. Borrowing perhaps some proportions from Litherland’s rack lever, Massey’s work is nonetheless detached. This is very different from, and a great improvement over, any frictional rest dead-beat escapement. Exactly where Massey got his idea is unknown. Suffice to say that detached lever watches had been made by numerous London based watchmakers after Mudge and, despite what you may have read, continued to be finished and sold after the death of Josiah Emery in 1797. " Zegarek morski służący do pomiaru przebytej odległości jaką pokonał statek podczas jednej wachty, wskazówki na tarczach stopera poruszały się z 2, 5 sekundowym opóżnieniem. (czterogodzinny, czyli tyle ile zwyczajowo trwa wachta) Wynalazek (patent) dotyczył bezkluczykowego nakręcania zegarków.* *Loomes, B. (2006). "Watchmakers and Clockmakers of the World", N.A.G. Press, London Britten, F.J. (1986). "Old Clocks and Watches and Their Makers - A History of Styles in Clocks and Watches and their Mechanisms", Bloomsbury Books, Londo