Scale 1:96. A dyeline copy of a plan, showing No. 2 [upper], No. 3 [main] and No. 4 [middle] decks, as fitted on the depot ship Forth (1938). This drawing shows the ventilation location markings with the risk & control markings on these decks. This is a modernisation plan drawn at Chatham Dockyard in 1966 and is noted as Sheet 2 of 4.