Miscellaneous correspondence and papers regarding engineering and new inventions. There are pieces on the Britannia Tubular Bridge, including the lifting of the bridge by R. Stephenson; stress in iron bridges; I.K. Brunel on his Chepstow bridge; notices and awards of the Institution of Civil Engineers; the Smeafonian Society for Civil Engineers; 'Caldwell's self-fleeting windlass'; advertisements for gutta percha; a report on vulcanised India-rubber joints by T. Wicksteed; a rapid water filter; a plan of Schrele's grinding mill; a report on hydro-carbon gas; a patent lever glass ventilation and the prospectus for the patent Siliceoss Stone Company; engravings of lighthouses and an account of Keith's Reef Lighthouse by A. Gordon; descriptions of Sir G. Cayley's hot air engine and other patent hot air propulsion; a proposed breakwater for Liverpool; and a derogatory poem on C. Babbage's calculating machine. The correspondents include J. Weale, H. James, A. de Morgan, Lord Wrottesley and C.J. Hargreave.