Caption:
Engineering Drawing - James Watt, General Section of Wanlockhead Engine, Sheet No.1, Jun 1785, Hand-coloured ink and watercolour drawing showing a general cross-section of an atmospheric condensing beam pumping engine designed by James Watt and supplied by the firm Bolton & Watt, of Birmingham, to the Margaret Mine, at Wanlockhead, Dumfries, Scotland, in 1785-86. Scale: 1/3 inch to 1 foot. The drawing is part of a set of technical drawings supplied by the manufacturers showing general