Capability for Mercantile Transport Service of Steam Ships : with reference to the mutual relation of their tonnage, displacement, engine power, steaming speed, distance to be run without re-coaling, tons wight of cargo, and the expense incurred per ton of cargo conveyed; being a paper read at the twenty-second ordinary meeting of the Society of Arts, May 16, 1855, the Right Hon. the Earl of Hardwicke in the Chair.