Scale 1:24. Plan shows the inboard profile and sections as fitted for the W class submarine W 3 (1915). A Sir W. G. Armstrong Whitworth builder's stamp, dated 8 March 1916 is printed on the drawing. An Admiralty Overseer stamp dated 18 April 1916 and bearing the signature of J. W. Dippy [Admiralty Overseer at Sir W. G. Armstrong Whitworth flourishing 1916] is also printed on the plan. The drawing shows the sections at Frames 7, 15, 24 and 33 looking forward. The plan also shows the sections at Frames 42, 46, 54, 62, 69 and 75 looking aft.