John Samuel Enys (21 September 1796 – 29 May 1872) was a British mining engineer and scientist who wrote several important papers on the "duty"[clarification needed] of steam engines and other types of power delivery, from water wheels to horses.
He also made numerous studies on the extensive mining industry in Cornwall.
[3] He did not appear to take an interest in farming, but rather became active in local politics and took a position as a magistrate as High Sheriff of Cornwall in 1824.
[6] With Henry de la Beche, Enys took up the topic of geology and mineralogy, which led to an interest in architecture.
During a trip to Italy he became interested in boats, and subsequently published several papers on improved buoys, reefing and hull shapes.