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HORCHER, Philippe. Three Books in Which the Construction of the Proportional Compass Is Taught, …, Mainz (Balthasar Lippius), 1605. Small in-4°, 54 pp., slightly browned, with one folded woodcut and others in the text. bound with GEPHYRANDER, Thomas, *Quadratura circuli nova perspicua, expedita, …*, Dortmund 1608. Ff. 12, unnumbered, woodcut illustrations in the text. Two volumes together, in a recent stiff vellum binding. Provenance Helvicus (inscription on the second endpaper, possibly by Christoph Helvig 1581–1617, chronologist, or a descendant) Cyril E. Kenney Collection (ex libris) Sotheby’s auction, *The Celebrated Collection … of C. E. Kenney …*, October 24–25, 1966, lot 2538. A rare treatise by Philipp Horcher (c. 1570–1615) that provides a description, one year before Galileo’s, of the proportional compass (note by Kenney inserted into the binding on p. 27). Gephyrander of Unna’s work on the quadrature of the circle is said to have been analyzed and discussed by Gaspar Schott in his *Magia universalis natura et artis*, Würzburg 1657. Provenance: library of Jean-Nérée RONFORT (1943–2012)
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