Miscellaneous correspondence and papers regarding engineering and new inventions. The correspondents include C.B. Vignoles, W.H. Barlow, B.A. Gould, F. Bashforth, E.J. Routh, W.H. Miller and W.B. Adams. Many of the papers are printed, and they include notices of meetings, pamphlets and circulars. The subjects covered include railways, with a diagram of the Playford Level Crossing; the Canterbury gas and water supply, with a sketch of a rotary valve for sewage pumps; gas meters; nickel plating; stone caissons made of Portland cement for the foundations of dock walls, bridges, etc.; F. Bashforth's Chronograph; a heavy breech-loading gun; the Holborn Valley Viaduct; and a new difference engine. There is also a paper by Airy titled 'Investigation of the Law of Progress of Accuracy in the usual process of forming a plane surface'.