Bernard James Tindal Bosanquet, a Middlesex amateur educated at Eton and Oxford, had spent years working on a delivery he called 'the bosie' — a ball delivered with an apparent leg-break action but, by twisting the wrist over at the last moment, spinning the other way. He worked on the technique using a tennis ball on a billiards table, refining it through the late 1890s.
Bosanquet first used it in first-class cricket around 1900, but it was the 1903-04 Ashes tour to Australia that gave it a public stage. In the first Test at Sydney, he bowled Trumper with a delivery that swerved in, pitched on a length, and hit the off stump — Bosanquet later said it was the first true googly bowled in Australia. By the fourth Test at Sydney, he took six for 51 in the second innings, bowling England to a 157-run win and securing the Ashes.
The googly transformed slow bowling. Reggie Schwarz, an Englishman playing club cricket with Bosanquet at Middlesex, learned the technique and took it back to South Africa. Within four years (by the 1907 SA tour of England) South Africa had four wrist-spinners — Schwarz, Aubrey Faulkner, Gordon White and Bert Vogler — all using the googly, and the team's bowling identity changed accordingly.