No scale. An ozatrace copy of a plan showing the cold and fresh water arrangements in No.1 boiler room used on the sonar trials ship Matapan (1945). Matapan was originally a Battle class destroyer that was converted into a sonar trials ship in 1971. This drawing is noted as Sheet 2 of 3 and was drawn by B. Hewitt [Draughtsman at Portsmouth Dockyard flourishing 1974].