Scale 1:48. Plan shows the sections, as fitted, for the Porpoise class submarine Grampus (1957). A Cammell Laird builder's stamp dated 18 July 1961 is printed on the drawing. The plan shows the sections at frames 8, 41, 71, 76, 84, 94, 111, 114, 118 and 123 looking aft. The drawing also shows the sections at frames 23, 30, 53, 61, 65, 79, 98 and 105 looking forward.