[Description and specification of] A Plan, Side and Cross Section for a Wrought Iron Ship/ Richard Trevithick [c. 1830] 2p. on 1 leaf. ["... a Wrought Iron ship scale one sixth of an Inch to the foot 70 feet Long and 35 feet Wide on the deck and 10 feet deep in the hold with three Iron Keels of 2ft wide with Iron ribs for strength[en]ing the hulls. The whole [rivetted] together the same as a steam engine boiler." Watermarked 1821. With ms. copy, in another hand, 31x19cm, watermarked 1821.]