Coffer Dam, and Wooden-Girder Bridge, Harraton, County Durham Design for a coffer dam for founding the piers of Harraton Bridge Press copy, plan, scale 1:36 Ink Signed 1783, and; Design for a scaffold bridge over the river Wear at Harraton in the County of Durham Elevation transverse section and plan, scale 1:72 Ink wash Signed 1783 1783