Over the years he diversified his business to include the production of vehicles, armaments, including shells and tanks, aircraft, airships and motorcycles. The original forge business continued to produce a wide array of steel materials, including armour plate, castings, axles, railway equipment, boiler plate and wheels. In 1900, he purchased land on the north bank of the Clyde at Dalmuir, adjacent to the famous yard of John Brown & Company at Clydebank. This he developed into one of the largest and most modern shipyards in the world, but the post-war decline in shipbuilding saw this yard close in 1936.