Scale: 1:48. A plan showing the elevation, plan, and section for an engine and boiler proposed to be fitted to a dredger. The engine was originally in the 'Wilberforce' (1840), an iron paddle exploration ship that was re-engined in 1842-3 with Carron engines.

Signed by T. Lloyd [Chief Engineer, Woolwich Dockyard, 1842-1847].