Lectures of experimental philosophy [electronic resource] : Wherein the principles of mechanicks, hydrostaticks, and opticks, are demonstrated and explained at large, by a great number of curious experiments: with a description of the air-pump, and the several experiments thereon: of the condensing-engines; as also of the different species of barometers, thermometers, and hygrometers; with several experiments to prove and explain sir Isaac Newton's theory of light and colours, as performed in a course of mechanical and experimental philosophy. By J. T. Desaguliers, M.A. F.R.S. Illustrated with several curious copper plates to each subject. To which is added, a description of Mr. Rowley's machine, called the Orrery, which represents the motion of the Moon about the Earth, Venus and Mercury about the Sun, according to the Copernican System: All carefully examined and corrected by Mr. Desaguliers. .