Section of cellular base of main span north tube from Robert Stephenson's (1803-1859) Britannia Bridge, Menai Straits. Completed in 1850, the two rectangular wrought iron tubes carried the Chester & Holyhead Railway over spans of 230 feet (70.1 metres) and 460 feet (140.2 metres). The bridge was destroyed by fire in 1970, but the piers re-used for a replacement railway bridge in 1972. A roadway was added above in 1980. See also 1929-614. Section of cellular base of main span N tube from
