Scale 1:48. Plan shows the sheer lines, body plan and longitudinal half breadth with guns and battery design drawing for a unnamed 250ft 3 masted Central Battery Ironclad Steam Frigate (1866). The title of the plan is "Design for an Ironclad frigate of 3082 Tons and 600 H. P. to be armed with 8 9 ton guns and 2 62 Tons guns".