| Description | Cornish Mine Engines (11 items).
1323. Poldice No. 3. Jan., Nov., Dec. 1783, Apr. 1786, Jul. 1791. 11 items.
Single-acting engine, with 63 inch cylinder, 9 foot stroke, chain connection. 64 inch cylinder fitted 1791.
General section of the engine and plan of the engine and boiler, outside front view of the engine and longitudinal and cross-sections of the boiler - reverse drawings; section and plan of condenser pumps, eduction pipe, steam pipe - reverse drawings; clack seat piece, marked "No. 1"; clack seat piece, wind bore, blast hole piece etc. - reverse drawing marked "No. 2".
Also the following later items: blast hole piece and section of pump - reverse drawing marked in pencil "suppose Poldice No. 3", with press copy sketch plan of reservoirs attached, Apr. 1786; sections of pump - reverse drawing with press copy sketch attached, Apr. 1786.
Also the following 2 drawings for Manor Mine [i.e. Herland Mine]: general view of the engine, plan of the engine and boiler - reverse drawings, Jul. 1791. Both these drawings bear letter codes.
Original Portfolio or 'Book' No. 36. Catalogue of Old Engines p. 300, 304.
For Poldice Mine. According to the List of Engines made at Soho, the engine was stopped in Apr. 1787 and sold to Chacewater Mine, where it worked from Jul. 1787 to Apr. 1789. The cylinder was then re-sold to Poldice, where it was used on their No. 2 engine, and all the other materials were sold to Herland Mine, or Manor Mine as it appears to have also been called. Herland bought a new 64 inch cylinder, which made the engine the largest single-acting Boulton & Watt engine in Cornwall. The engine was still at work in May 1798, and in 1799 the cylinder broke and was replaced. Henry Hazleton erroneously identified this as a complete new engine for Herland in the Catalogue of Old Engines.
See also: Engine Agreements (Manor Mine), Portfolio 5/1294b. |