Tresavean, 1779, 1780, 1783

Cornish Mine Engines (18 items).

1290. Tresavean. Jun., Jul., Sep. 1779, Apr. 1780, Feb., May 1783. 18 items.
Single-acting engine, with 28 inch cylinder, 8 foot stroke, chain connection.

General view of the engine, front view of the engine and boiler (2 copies, one with gudgeon and plummer block on the same sheet), ground plan of the engine and round boiler (2 copies), first floor plan of the engine and round boiler (2 copies, 1 with steam pipe on the same sheet); plan and section of the engine house - reverse copy (dated Jun. 1779 - the earliest reverse copy?); section and plans of cylinder, air pump bucket etc. - 2 copies, 1 partially coloured and the other marked "duplicate"; side view and plan of the working gear - 2 copies, 1 coloured and marked "direct", the other marked "Tresavean and Penryndee" and "reverse" (both are the same way round); front and side views of injection gear [?] - unmarked coloured drawing; eduction pipe; plan and section of the boiler.
Also the following later items: sections and plan of boiler - reverse drawing, Feb. 1783; general view of engine, marked "Proposed engine for Tresavean" and showing an engine with a rack and sector connection - reverse drawing, May 1783; front view of the engine and plan of the cistern - reverse drawing, May 1783. These last two items may relate to an engine proposed but never built.

Original Portfolio or 'Book' No. 6. Catalogue of Old Engines p. 300.

For Tresavean Mine. The name of the mine is frequently spelt as "Treseavain" or "Tresavaine". According to the List of Engines made at Soho, the engine stopped in Jan. 1787. Tresavean Mine lay idle for several years, and in 1794 the engine was sold to the North Downs Mines, who erected it at Wheal Peever. It was still at Wheal Peever in May 1798. The List of Engines made at Soho gives the cylinder diameter as 30 inches, but the Engine Book, Southern's List of Books, the Drawing Office Index and the drawings themselves give the diameter as 28 inches.

See also: Engine Agreements.