DESAGULIERS, John Theophilus (1683-1744). Lectures of Experimental Philosophy, wherein the principles of mechanicks, hydrostaticks and opticks, are demonstrated ... to which is added a description of Mr. Rowley's machine called the Orrery, London: for W. Mears, 1719, 4°, FIRST EDITION, 10 folding engraved plates (some plates slightly cropped at outer margin, Q1 with short tear at upper margin), contemporary panelled calf (rebacked, joints worn, John Crerar library stamps) [Wheeler Gift 249]; and 7 others, including a work on optics by William Emerson, and 2 works by Benjamin Martin (one known to lack 4 plates). (8)