 He purchased the brewery's first steam engine in 1805, greatly increasing Truman's ability to supply the rest of the country.Renowned for demanding high quality raw materials, under his control Truman's expansion continued apace – porter production doubled between 1800 and 1820 from 100,000 to 200,000 brewers barrels a year.In 1808, Hanbury's nephew Thomas Fowell Buxton joined the firm and went on to play a big role in Truman's future, as well as leaving his mark on national history.