Scale 1:48. Plan shows the hold and sections of a 210ft unnamed proposed 3 masted steam gun vessel to carry 4-12 1/2 Ton Guns (1868). The sections shown on the drawing are situated at Fraes 11, 19, 29, 35, 47 and 55. The title of the drawing is "Plan of Hold for Gun Vessel of 300 Nom H.P. to carry 4 No. 12 1/2 Ton Guns". There is a large tear along the top edge of the plan.