| Description | Plan and profile of the [working] beam for the returning engine at Walker Colliery
Plan and elevation, scale 1:12
Ink wash
Signed 1783
Inscribed in red: Design for the cylinder beams, regulator, and injection cap, see Kinnaird; rack and wheel for injection cock and bucket leathering, see Seacroft engine; a link of the chains and method of harnessing piston and piston bottom, see Beaufort engine. |