| Description | Cornish Mine Engines (22 items).
1289. United Mines, Poldory. May 1779, Apr. 1780. 22 items.
Single-acting engine, with 48 inch cylinder, 8 foot stroke, chain connection.
Set of numbered coloured drawings, 1779:
[No. 1 not used]; No. 2 - general view of the engine; No. 3 - inside view of the engine and longitudinal section of the boiler; No. 4 - outside front view of the engine and part of the boiler; No. 5 - ground plan of the engine and boiler and cross-section of the boiler; No. 6 - first floor plan of the engine and boiler; memorandum "Reference to Drawings No. 2, 3, 4, 5 & 6."
Copies of the above drawings:
General view of the engine; general view of the engine and first floor plan of the engine and boiler - 2 drawings on 1 sheet; inside view of the engine and longitudinal section of the boiler - 2 copies, 1 coloured and 1 partially coloured; outside front view of the engine and part of the boiler; ground and first floor plans of the engine and boiler and cross-section of the boiler - 3 coloured drawings on 1 sheet; ground plan of the engine and boiler and cross-section of the boiler - 2 copies, 1 partially shaded; first floor plan of the engine and boiler.
Other components:
Section and plans of the cylinder, air pump bucket, condenser etc. - partially coloured drawing with copy marked "duplicate"; plan of the beam, section of piston, chain link etc., with copy marked "duplicate"; plan and elevation of the working gear - partially coloured direct and reverse copies; eduction pipe.
Original Portfolio or 'Book' No. 5. Catalogue of Old Engines p. 300.
For United Mines. Poldory Mine was part of the United Mines. According to the List of Engines made at Soho, the engine stopped in Dec. 1794 when the cylinder had worn out completely, and it was replaced by a 60 inch engine formerly at Pool Mine.
Published references: Dickinson & Jenkins p. 235, plate LXXXIV - ground plan of the engine and boiler and cross-section of the boiler.
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