Mezzotint, Conference of engineers at Britannia Bridge. Scott after John Lucas, 1858; After the oil by Lucas, 1851-53, in the Institution of Civil Engineers London. - Proof issued April 1858. – Old mount title: Robert Stephenson, M.P. and the most celebrated engineers raising the tubular bridge. - Artist witnessed float of 4th tube. Portrait, Robert Stephenson seated centre at table with plans and instruments; around him, seated or standing, Locke, Brunel, Bidder, Wild, L and E Clark, Forster, and Ross, civil engineers; Moorson and Claxton, nautical specialists; Hemmingway, master mason; background panorama of completed bridge [1850] over Menai Strait