 The works expanded over the next few years, developing Henry Cort's puddling process, to become the largest ironworks in the world by 1806.During this period Watkin George also constructed or designed Pont-y-Cafnau (1792-93 - an iron tramway bridge and aqueduct), Gwynne water aqueduct (1793-96 - a timber trestle structure 185m long, part of which ran over Pont-y-Cafnau), Melingriffith water pump (1793-1795), Aeolus waterwheel (1793-97 - a 50 ft diameter cast iron waterwheel), the Merthyr Bridge (1799-1800 - a single shallow arch of cast iron), and Ynysfach Ironworks (1801 - the two blast furnaces bore his initials).Around 1805 Watkin George left Cyfartha to become a partner at Pontypool Ironworks where he undertook a number of changes including the demolition of a wire works at Pontymoile, a new tinplate works and waterwheel at Pontymoile and two tinplate works at Lower Mill, near Pontymoile.