Poster Selection Steel Production to include The High Frequency Induction Furnace, illustration by Cuming /53, Haycock Press, 51 x 76cm., Iron into Steel, The Open-Hearth Furnace for British Iron & Steel Federation, sheet 4, 51 x 76cm. and Steel, The Sinews of the Nation, Publicity Ats Ltd. 75 x 50cm (3)