Scale 1:48. Plan shows the main deck for an unnamed 225ft 3-masted armour clad turret ship as proposed by Cowper P. Coles, Captain, Royal Navy (1865). A fly diagram is attached over the middle of the main deck. The title of the plan is "Plan of main deck of an Armour Clad Turret Ship on Capt C. P. Coles principle to carry two 600 pdr or two 300 pdr and four smaller guns per Admiralty Order of 12 December 1864". The plan bears the signatures of Cowper Phipps Coles [Captain Royal Navy 1819-1870] and Joseph Scullard [Head Draughtsman Portsmouth Dockyard 1865]. There is a large tear on the drawing where the fly diagram is attached to the drawing.