John Playfair


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Playfair, John,

1748–1819, Scottish mathematician, physicist, and geologist. He was educated at St. Andrews and Edinburgh and taught first mathematics and then physics and astronomy at the latter university. His Illustrations of the Huttonian Theory of the Earth (1802) elucidated the methods and principles of his friend James Hutton and established uniformitarianism as the foundation of the new science of geology. He also published texts on geometry, physics, and astronomy.
References in periodicals archive ?
As his friend John Playfair later wrote: "The mind seemed to grow giddy by looking so far into the abyss of time."
South Africa-born Prue, who is now married to John Playfair, took over from Mary Berry on Great British Bake Off in 2017 after the show's controversial switch from the BBC to Channel 4.
Prue and husband John Playfair, 72, have booked a week's fishing on the river Naver in the far north of Scotland for her 80th.
She married retired clothes designer John Playfair three years ago.
Rayne died in 2002 and Prue married John Playfair three years ago.
"He has no problem about gender, he doesn't mind holding my handbag" Great British Bake Off judge Prue Leith on her husband John Playfair.
"My dog could have won a better deal than those forelocktugging drones we sent out to battle Brussels" Jeremy Paxman "He has no problem about gender, he doesn't mind holding my handbag" Great British Bake-Off judge Prue Leith on her new husband John Playfair "I don't know whether I believe in the afterlife or not.
"He has no problem about gender, he doesn't mind holding my handbag" - Great British Bake-Off judge Prue Leith on her new husband John Playfair.
FAMOUS FACES ASKED about being approached by fans, Prue, who married retired fashion designer John Playfair in 2016, says she likes "the attention" - which gets a laugh from Paul.
Since the 2014 edition she has married John Playfair and been chosen as Mary Berry's high-profile replacement on Bake Off.
These three were the physician and experimental farmer James Hutton, the mathematician John Playfair and the naturalist James Hall.