'Entrance to the Tunnell leading to Sapperton Hill, Gloucestershire', 1792.
© Science Museum / Science & Society Picture Library
Sepia-toned aquatint showing a barge about to enter the tunnel on the Thames & Severn Canal at Sapperton Hill, Gloucestershire. The digging of the 2-mile long tunnel took five years, and when it opened in 1786 it was the first canal tunnel to be built wide enough to allow the pasage of broad beam barges. Published in S Ireland's 'Picturesque Views on the River Thames'.