Scale 1:24. Plan shows the water tight double bottom, water ballast compartments and sections of the Minotaur class broadside ironclads Minotaur (1863). The sections shown are stationed aft of the boiler boom and aft of the shell room. The title of the plan is "Sketch shewing watertight double bottom and water ballast compartments as proposed for HMS Minotaur". A Thames Iron Works Builder's stamp, dated 15 July 1862 is printed on the plan.