This pamphlet was published in 1849 and provides an account of the engineering works involved in the construction of the Britannia Bridge across the Menai Straits. The bridge was designed by Robert Stephenson, son of the locomotive pioneer George Stephenson, and was built to carry trains from the mainland to Anglesey. The construction of this 'tubular bridge' posed a number of difficult engineering challenges. The two iron tubes, which measured 472 feet long and weighed around 1800 tons each, were floated into position, then raised by hydraulic pumps to their final destination.