Scale 1:48. Plan shows the sheer lines, body plan and longitudinal half breadth for an unnamed 345ft Iron Cased Monitor Turret Ship (1866). The title of the plan is "Design for an Iron Armour Cased Monitor Turret Ship of 1200 H. P.". The words "No. 3 Design" are written on the drawing. The words "1866 No.3 First Class Monitor" are written on the reverse of the plan. There are large tears on the right hand edge.