London & Cambridge: Geo Strahan & G. Thurlbourn, 1741. 8vo. [xx], 291,  pp. Sixth edition. With 12 folding plates. Engraved title vignette. Contemporary calf; some light browning and foxing. Ownership inscription on first fly-leaf. Item #13868
Sixth edition (first published in 1701) of Keill’s lecture notes on Newtonian mechanics. Also included is a chapter in support of Huygens’ approximation of the quadrature, in which he located the center of gravity of a segment of a circle. Keill (1671-1721), a famous mathematician and astronomer, was a friend and early champion of Isaac Newton and his Principia. He was a lecturer and the first to teach natural philosophy by experiments in a mathematical manner at Oxford. As a member of the Royal Society, he contributed many papers, chiefly in support of Newton. Keill attacked Spinosa and Hobbes, and discredited Leibniz and Bernoulli in order to protect and maintain Newton’s priority.