The drawing is by R. Burns, inked by J. Vaughan, and a note reads 'Buttress drawn perpendicular to sloping faces, not in vertical projection'. The sheet is marked 'recd 7 12 88'.
This is part of the Volume: PF/DER Derwentcote Steel Furnace, Derwentcote, County Durham; within the Series: EHC01/022 English Heritage Plans and Measured Drawings; within the Collection: EHC01 English Heritage(EH):Archive
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Creator of Archive: Burns, R