Scales 1:2 and 1:1. An ozatrace copy of a plan showing the arrangement of the guard stanchions and chains around the water tight hatches 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 6 of 7 and drawn by L. W. Reeves [Draughtsman at Portsmouth Dockyard flourishing 1974].