John Ridley migrated from England to South Australia in 1840. He became a miller and wheat farmer and in 1843 developed a harvesting machine that reaped and threshed grain. In seven days it was able to reap and thresh more than 70 acres, stripping the grain from the stalks. The South Australian Agricultural and Horticultural Society recognised his achievement and awarded Ridley a prize of ten pounds and ten shillings.
In the 1840s the wheat crop in South Australia was increasing and there was a shortage of agricultural labour to harvest it. This made the development of more effective harvesting machinery important. Ridley’s invention was well suited to Australia’s hot, dry conditions. It ensured that the grain was kept dry and that its quality was maintained – important for what was an export crop.
There has been ongoing controversy the true inventor of the stripper. Some claim that the machine was in fact invented by John Wrathall Bull, even though Ridley was the first to demonstrate it in practice. Historians have argued both sides of the case. Bull did develop a working model of a machine in 1842. Ridley denied having been inspired by Bull’s design, writing in 1886 that he had drawn inspiration for his machine from a notice of a Roman invention given in John Claudius Loudon’s Encyclopaedia of Agriculture, and that “from no other source whatever did I receive the least help or suggestion”.