Titel: Usage du compas du proportion.
Verlag: Paris, Michel Daniel, 1618
8vo (165 x 100 mm), pp [viii] 90 , with two engraved plates of the proportional compass and several woodcut illustrations in text; some faint marginal waterstaining on last leaves, otherwise a very good copy in contemporary French mottled calf, gilt floral ornaments on spine. £4250First edition, rare, of Henrion's treatise on the proportional compass, the earliest French work on the subject. Henrion attributed the invention of the compass to Jacques Alleaume, who had constructed a version of it in Paris.'Henrion had seen a sector, made by Jacques Alleaume, in Paris. Seven years later, in 1623, Edmund Gunter published his work on the sector with no attribution of its invention to others. Henrion assumed that Alleaume had invented the sector and claimed any improvements as his own. It is obvious that Henrion was not aware of the earlier publications of Hood, Galileo, and several others. He goes on to claim that an unnamed individual (Gunter) had stolen the idea for the sector from him. In this work, Henrion describes a very simple sector made in 1616 by Daniel Chorez, a major French instrument maker of the day. This sector had only four scales (lines of lines, chords, planes and solids).'This work, like Gunter's in England, was the one that introduced the sector into France. It was well received and went through at least twenty different editions' (Tomash and Williams).It has been asserted that 'Denis Henrion' was in fact a pseudonym of the Baron Clément Cyriaque de Magnin (1580-1643), who also wrote under the pseudonym 'Pierre Hérigone'. The Dictionary of Scientific Biography gives separate entries to both Henrion and Hérigone.Provenance: contemporary signature 'Aleaume', possibly Jacques Alleaume (1562-1627, mathematician and instrument maker) on title; French annotations in a seventeenth-century hand on endleaves; inscription in French signed François Rolpot dated 7 October 1766 on rear endleafGoldsmith H246; Tomash and Williams H109; OCLC lists Illinois, Michigan, and Brigham Young. Buchnummer des Verkäufers 3261
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