Philosophia Britannica [electronic resource] : or, a new and comprehensive system of the Newtonian philosophy, astronomy, and geography, in a course of twelve lectures, with notes; Containing the Physical, Mechanical, Geometrical, and Experimental Proofs and Illustrations of all the Principal Propositions in every Branch of Natural Science: Also, A particular Account of the Invention, Structure, Improvement and Uses of all the considerable Instruments, Engines, and Machines; With New Calculations relating to their Nature, Power, and Operation. The whole collected and methodized from all the principal authors, and Public Memoirs; and embellished with eighty-one copper-plates. By B. Martin.