South of England - S3.E9

Adam Hart Davis begins another cycling tour in search of more tales of pioneering inventors in an eight-part fourth series.

Hart-Davis begins by exploding balloons of hydrogen and oxygen in London, just as Henry Cavendish did in the late 18th century to prove that water was H20. He also stops in Hungerford, Berkshire, where farmer Jethro Tull invented the seed drill in 1701.