Sirhowy Iron Works, Monmouthshire, 1799

Vacuum and Blowing Engines (20 items).

20 horse power double-acting engine, with 23¾ inch cylinder, 5 foot stroke, parallel motion.

Coloured original and reverse general view of the engine and blowing cylinder and second beam connected to fly wheel, plans of the engine and boiler and blowing cylinder, front view of the engine and cross-section of boiler, longitudinal section of boiler; reverse plan and sections of the engine house, framing, boiler and blowing cylinder, drawings of the cistern; blowing cylinder and pipes - reverse plans and sections; working gear - coloured original and reverse front and side views (the reverse drawing is also marked "EJF Joshua Walker & Co."); parallel motion - coloured original and reverse drawings; section of part of piston - original and press copy drawings; sketch of valve; sketch plan of premises showing furnaces, water wheel, blowing cylinder, proposed engine house etc. All the drawings bear letter codes except the last 4 items.

Original Portfolio or 'Book' No. 335. Catalogue of Old Engines p. 270.

For Fothergill & Co. Sirhowy Iron Works, near Abergevanny, Monmouthshire. The engine worked a blowing cylinder and also a crank shaft, which was worked by a second beam connected to the main one.