He was the son of the Glasgow merchant George Buchanan, and his first wife Jane Gorvie. In the early 1790s he was working at
Rothesay for
David Dale. His interests spread out from mill machinery, to pumps and heating. He also went into bridge construction. In 1808 Buchanan was working for
Henry Houldsworth at
Cranstonhill, building a large waterworks. The following year he set up in business at
Port Dundas, and in 1810 he became a burgess of Glasgow. In 1811 he was working on an early railway proposal in Scotland, to run from
Dumfries to
Sanquhar. Buchanan died on 22 July 1816, at the house of Alexander Innes (a father to one of Buchanan's stepmothers) of
Creech St Michael, near
Taunton, in his forty-sixth year. ==Works==