Works and correspondence on steam engines and propellers as used in sea-going vessels, including J. Seaward's accounts of the steam engine used for the frigate 'Gorgon' and its performance; R. Cunningham on rotary steam engine; writing on Hoseason's expansive gear in 'The United States Services Gazette'; a report on the Earl of Dundonald's rotary engine; diagrams on card of a revolution of the propeller shaft; plans of pistons; a paper by A.H. Renton, including drawings of economy of fuel on board steam vessels; improvements in boilers as observed on the 'Janus'; H. Molyneux on the loss of power in steam engines; tests on various propellers; Airy's views on propellers and design; J.P. Nichol on ships lost and wrecks; and pieces on iron masts and lifeboats. The correspondents include W.H. Smyth, W. Denison and W. Fairbairn.