The Principles of Mechanics. Explaining and demonstrating the general laws of motion, the laws of gravity, motion of descending bodies, projectiles, mechanic powers, Pendulums, Centers of Gravity, &c. Strength and Stress of Timber, Hydrostatics, and Construction of Machines. A Work very necessary to be known, by all Gentlemen, and Others, that desire to have an Insight into the Works of Nature and Art. And extremely useful to all Sorts of Artificers; particularly to Architects, Engineers, Shipwrights, Millwrights, Watchmakers, &c. or any that work in a Mechanical Way.

Second edition, corrected, and very much enlarged, 4to (245 x 185 mm), [2], viii, [2], 284p., 43 copper-engraved plates, cont. calf, rebacked, corners rubbed. "William Emerson (1701-1782), an English amateur scientist who spent most of his life in seclusion at Hurworth in Durhamshire, Emerson was mainly interested in mathematics, astronomy, physics, and medicine. He is known for his so-called "Emerson Paradox". the Mechanics was very popular and went through several editions. It deals with the general laws of motion, descent of bodies, centers of gravity, mechanical powers, comparative strength of timber and its failure, forces of engines and their motion, as well as friction, hydrostatics, and pneumatics. The volume also poses the Emerson Paradox."Roberts & Trent. Robert & Trent, Bibliotheca Mechanica, pp. 101-02.