No Scale. A ozatrace of a plan, showing the profile and deck plans illustrating the piping diagrams for the Main Systems Board, as fitted on the exercise minelayer Abdiel (1967). There is a colour scheme for different pipes on the drawing. The salt water pipes are coloured in red ink, the circulating pipes are coloured in yellow and the pumps are coloured in brown. A Vosper Thornycroft builder's stamp dated 8 January 1968 is printed on the drawing. A Vosper Thornycroft Principal Ship Overseer stamp, dated 8 January 1968 is also printed on the plan.