EMERSON (William): - Calculation, Libration, and Mensuration: Or the Arts of Reckoning, Weighing, and Measuring. Being a Mechanical Work, adapted To the Business and Practice of Tradesmen and Artificers, in the shortest Method possible, and designed purely for common Use.

London: Printed for J. Nourse..., 1770. FIRST AND ONLY EDITION. 8vo, 205 x 130 mms., pp. [ii], v [sic, for iv], 7 - 168, 3 folding engraved plates, disbound. Emerson (1701 - 1782), a thoroughly practical man writes in the preface that mathematics is in daily use, but, "to oblige the lower sort of readers (for everyone is not destined to study the sublime parts of the Mathematicks) I have composed the following Treatise." One would guess that the "lower sort of readers" consisted of about 90 per cent of people in the 18th century who bought books. Part II is on "Geometrical Problems, and the Measuring of Lines" and describes a "Sliding rule" and its use.

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