Scale 1:24. Plan shows the plan of the flat and sections, as fitted of the C class submarine C 19 (1909) and C 20 (1909). A Chatham Dockyard Manager of Constructive Department stamp, dated 11 May 1910 and bearing the signature of J. Ollis [Manager of Constructive Department at Chatham Dockyard 1907-1915] is printed on the drawing. The plan shows the sections at Frames 3, 11, 17, 25, 32 and 37 looking aft. The drawing shows the sections at Frames 45, 56, 62, 67, 72, 79, 82 looking forward.