Description:Drawing 'No. 2' of general section of cornish mine pumping engine, for the Poldory Mine.
This engine was a typical Cornish pumping engine made by Boulton & Watt. It was single-acting, with a 48 inch cylinder and an 8 foot stroke. Poldory Mine was part of a group or 'set' of mines known as United Mines. The engine worked until 1794 when it was stopped due to the cylinder being completely worn out. It was replaced with a larger second-hand engine that United Mines bought from Pool Mine. This is a rare almost complete coloured set of drawings for a Cornish engine, with the explanatory key still surviving. The drawings are numbered 2 to 6 – what drawing No. 1 was is not recorded. [Scale: 3 feet to the inch]
This drawing is part of the Archives of Soho collection, which is held by Birmingham City Archives [Ref. MS3147/Portfolio/5/1289]