No scale listed but the drawing is drawn at approximately 1:192. Plan shows the a outboard profile view, illustrating the sail arrangement and a plan view of a unnamed fast iron corvette (1870). The title of the plan is "Fast iron corvette of 2321 tons. To have a double bottom and to be made specially strong for ramming". There are annotations relating to the armament of the vessel on the drawing. There is a large tear on the right hand edge.