From 1906 the company had been involved in early experimentation with a six-rotor helicopter based on the design of a ship propellor and the Mumford helicopter first flew in 1914. Naval architect Maurice Denny, grandson of Peter Denny, became a partner in William Denny & Brothers in 1911. In 1868 Peter Denny took his son, William Denny, an experimental scientist, into partnership and the company subsequently built the world’s first tank for testing ship models in a commercial shipyard. William Denny & Brothers soon became involved as a supplier of ships to, and an investor in, P Henderson & Co, a Glasgow shipping company and also expanded its own Dumbarton shipbuilding operation by creating a new purpose-built yard. In 1862 James Denny and John Tulloch resigned and Peter Denny became sole partner of the shipyard, William Denny & Brothers, and a partner with John McAusland in the re-formed engineering company, Denny & Co. In that year the firm acquired North Yard, Dumbarton, and extended the engineering shops of Tulloch & Denny. By 1859 the total assets of the company in shipping, shipbuilding and engineering amounted to £136,634. After William Denny’s death James and Peter began to expand the company’s business, investing in other shipping companies, building ships speculatively and operating vessels. In 1850 Peter Denny, John Tulloch and John McAusland set up a separate marine engineering company, Tulloch & Denny, in Dumbarton to fit out the ship hulls produced by William Denny & Brothers. In 1849 Alexander left the firm which was renamed William Denny & Brothers. In 1846 a fourth brother, James Denny, joined the partnership. By 1845 the firm had leased both Kirk Yard and Wood Yard at Dumbarton, near the confluence of the rivers Leven and Clyde. In 1844, after Denny’s death, three of his sons, William, Alexander and Peter, set up in partnership as Denny Brothers, marine architects, to design and build iron steamers. History: William Denny was involved in building ships at Dumbarton, Scotland, by 1811, and the firm became William Denny & Son in 1823.
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