Trevithick was a man of versatile talents, and his activities were not confined to small applications. Trevithick developed his large Cornish boiler with an internal flue from about 1812. These were also employed when upgrading a number of Watt pumping engines; by this time Arthur Wolf had already produced high-pressure engines whilst working at Meux brewery in London, in his efforts to improve efficiency, thus saving coal, as he had been trained by Joseph Bramah in the art of quality control, which resulted in him becoming chief engineer at Harveys of Hayle in Cornwall, by far the largest and leading manufacturer of steam engines in the world.