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2015-12-22 18:21:09
OZANAM, Jacques.
L'Usage du Compas de Proportion, expliqué et demontré d'une maniere courte & facile, & augmenté d'un Traité de la division des Champs.
Two engraved plates & numerous woodcut illus. in the text. 150 pp., [2] pp. of publisher's ads. 8vo, cont. calf (small defect to foot of spine), spine richly gilt, red morocco lettering piece on spine. Paris: C.A. Jombert, 1736. About the sixth edition, "corrigée & augmentée," of this noteworthy and popular book on the sector which went through numerous editions until 1794. The engraved plates depict a sector by Chapotot, one of the most important instrument makers of the time who supplied instruments to Cassini and La Hire. The compass of proportion, developed by Galileo, Galgemair, and others, was a general purpose mechanical calculator capable of solving any practical mathematical problem that was likely to arise. The proportional compass, widely used in the 17th century, was of similar importance as the electronic calculator is to today's society. A lovely copy. ❧ D.S.B., X, pp. 263-65. Tomash O72-"This edition is identical to the first with the exception that someone has modified the sector to include the scales needed to solve the artillery caliber problem." .
Bookseller: Jonathan A. Hill, Bookseller, Inc.
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