author
John Playfair
1748–1819
A Scottish mathematician, geologist, and teacher, he helped make big scientific ideas easier to understand, especially in geometry and the new study of the Earth. His clear writing and lively lectures made him one of the best-known scientific voices in Enlightenment Edinburgh.
1 Audiobook
Illustrations of the Huttonian Theory of the Earth
by John Playfair
About the author
Born in Benvie, near Dundee, on March 10, 1748, he studied at the University of St Andrews and was originally prepared for the ministry. He later built his career at the University of Edinburgh, first as professor of mathematics and then as professor of natural philosophy, becoming a central figure in the city’s intellectual life.
He is especially remembered in mathematics for the version of Euclid’s parallel postulate now known as Playfair’s axiom, and in geology for explaining and spreading the ideas of his friend James Hutton. His book Illustrations of the Huttonian Theory of the Earth helped present Hutton’s difficult ideas in a much clearer form and played an important part in the growth of modern geology.
Playfair was admired not only for his scientific work but also for the grace and clarity of his prose. That gift for explanation made him influential far beyond his own lectures, and it is a big reason his name still appears in the histories of both mathematics and earth science.