Scale 1:48. Plan shows the hold and sections of an unnamed 290ft Central Battery Ironclad (1867). The plan shows the sections at Frames 37, 61, 73, 85 and 115. The drawing bears the signature of John Ford [Managing Director of Thames Iron Works]. The plan is badly torn. The title of the plan is "Plan of Hold of an Ironclad of War of 3793 Tons and 800 Horse Power, Designed for the Lords Commissioner of the Admiralty".