|Description||Copy of a scheme for a perpetual watch or clock by J Smeaton, invented and wrote down, 1741. December 24th.|
Manuscript and sketch, two leaves. Ink.
Inscribed in the hand of John Farey: This is a copy of one of the earliest of Mr Smeaton's papers. A clock in Coxes Museum on this principle, but constructed in a better manner with a column of mercury in glass. See Nicholson's Journal, quarto, III , 126, and octavo 9 , 1804. 212. Mechanical Magazine 10 , 273