Salomon Coster (c. 1620–1659) was a Dutch clockmaker of the Hague, who in 1657 was the first to make a pendulum clock, which had been invented by Christiaan Huygens (1629-1695). Costers' earliest pendulum clocks were signed "Samuel Coster Haghe met privilege" indicating that he had been authorized by the inventor to make such clocks. John Fromanteel, the son of a London clockmaker, Ahasuerus, went to work for Coster. He was one of many foreign clockmakers to soon make pendulum clocks following the prototype by Huygens and Coster. A contract was signed on the 3 September 1657 between Salomon Coster and John Fromanteel which allowed Frontmanteel to continue making the clocks. This clock design was heralded as a new beginning in the clockmaking industry due to its level of timekeeping accuracy which was previously unheard of.
- Hans van den Ende, et al.: "Huygens's Legacy, The Golden Age of the Pendulum Clock", Fromanteel Ltd., 2004,
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- Hoijmaijer, Hans (2005). Telling time - Devices for time measurement i museum Boerhaave - A Descriptive Catalogue. Leiden: Museum Boerhaave.
- No Author given (1988). Christiaan Huygens 1629-1695, Chapter 1: Slingeruurwerken. Leiden: Museum Boerhaave.
- R. Memel en V. Kersing: Salomon Coster, de Haagse periode; het Tijdschrift 2014-4 en 2015-1