Mature Work
In 1795 Playfair published an alternative, more stringent formulation of Euclid's parallel postulate, which is now called Playfair's axiom; though the axiom bears Playfair's name, he did not create it, but credited others, in particular William Ludlam, with the prior use of it.
In 1802, Playfair published his celebrated volume entitled Illustrations of the Huttonian Theory of the Earth. The influence exerted by James Hutton on the development of geology is thought to be largely due to its publication. In 1805 Playfair exchanged the chair of mathematics for that of natural philosophy in succession to John Robison, whom also he succeeded as general secretary to the Royal Society of Edinburgh. He took a prominent part, on the liberal side, in the ecclesiastical controversy that arose in connexion with Sir John Leslie's appointment to the post he had vacated, and published a satirical Letter (1806).
Playfair was an opponent of Gottfried Leibniz's vis viva principle, an early version of the conservation of energy. In 1808, he launched an attack on John Smeaton and William Hyde Wollaston's work championing the theory.
Although a wealthy man, Playfair was buried in an unmarked grave in Old Calton Cemetery, on Waterloo Place in Edinburgh. However, the monument to his memory, on Calton Hill, is visible from the spot.
Read more about this topic: John Playfair
Famous quotes containing the words mature and/or work:
“Do they merit vitriol, even a drop of it? Yes, because they corrupt the young, persuading them that the mature world, which produced Beethoven and Schweitzer, sets an even higher value on the transient anodynes of youth than does youth itself.... They are the Hollow Men. They are electronic lice.”
—Anthony Burgess (b. 1917)
“It is the work of a brave man surely, in whom there was no guile! He rounded this water with his hand, deepened and clarified it in his thought, and in his will bequeathed it to Concord. I see by its face that it is visited by the same reflection; and I can almost say, Walden, is it you?”
—Henry David Thoreau (1817–1862)