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Playfair, John 1748-1819
Scottish mathematician, physicist and geologist

Born in Benvie, near Dundee, he studied at St Andrews University and in 1785 became joint Professor of Mathematics at Edinburgh, where he produced a successful edition of Euclid's Elements, but in 1805 he exchanged his appointment for the chair of natural philosophy. He was a strenuous supporter of James Hutton's uniformitarian theory in geology and travelled widely to make geological observations. His Illustrations of the Huttonian Theory (1802) was a landmark in British geological writing. He published his contributions to mathematics in Elements of Geometry (1795).