Engraving. 'Conference of Engineers at the Menai Straits preparatory to floating one of the tubes of the Britannia Bridge'. Signed by Robert Stephenson. Painted by John Lucas. Engraved by James Scott. Published by Henry Graves and Company, Printsellers in Ordinary to Her Majesty and HRH Prince Albert, 6 Pall Mall, London. 1858/01/25.