| Description | 6 horse power sun & planet engine, with 18 inch cylinder, 4 foot stroke, three-bar motion.
Includes reverse sections and plans of engine and framing; three-bar motion; cylinder (marked "For the piston knobs see drawing of Mr. Whitbread's"), nozzles (full size drawings), working gear, connecting rod; boiler; sheet of drawings of various components marked "Reverse copy of this, sent to Bersham Dec. 1784"; plans and sections of the engine in situ and the mill showing large horizontal wheel and millwork, some of which were sent by Stonard & Curtis and copied at Soho; elevation and plan of the mill; letter from James Cooper to James Watt [?] dated 1 Oct. 1784, with sketch of the millwork.
Also a drawing of 2 nozzles dated 8 Feb. 1790 marked "redrawn 29 Feb. 1792" and coded AOO. This drawing included a copy of Stonard & Curtis' nozzles and was sent to Soho. The Drawings Day Book describes it as a drawing of "Nozzles 9, 12."
Original Portfolio or 'Book' No. 52. Catalogue of Old Engines p. 18.
For Jonathan Stonard and James Curtis. Starch manufactory, High St., St. Mary's, Lambeth, London.
See also: Engine Agreements, Incoming Correspondence.
Published references: Dickinson & Jenkins, p. 142, 164, 200, plate LXV - three-bar motion; Tann, p. 55 - plan & elevation of mill.
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