Mezzotint by Scott after John Lucas (1807- 1874) of a conference of engineers congregated in front of the Britannia Bridge. The Britannia Bridge was designed by Robert Stephenson to carry rail transport over the Menai Straits near Bangor in Wales. It was the first railway bridge designed as a deep box girder and opened on 5 March 1850. The original bridge was destroyed by fire in 1970.
© Science Museum / Science & Society Picture Library