Unnamed 75 feet tug and cargo screw steamer for the Royal Naval Ordnance Depot Portland or Portsmouth

Scale 1:24. Plan shows the midship section of an unnamed 75 feet tug and cargo screw steamer for the Royal Naval Ordnance Depot. This vessel may have been used for the Royal Naval Ordnance Depot at Portsmouth or Portland, but it is not certain for which one.The title of the plan is 'Tug for R. N. O. D.' The paper is very fragile, torn and brittle in many places.