VENTURI, Giovanni Battista.

Commentari sopra la Storia e le Teorie dell' Ottica...Tomo Primo

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[all published]. Fine engraved frontis. port. of Bonaventura Corti & ten engraved plates (including “VIII” & “continua VIII”). 1 p.l., xxxii, 246 pp. Large 4to, later wrappers (some occasional foxing), uncut. Bologna: Masi Brothers, 1814. First edition. Venturi (1746-1822), professor of physics at the Universities of Modena and Pavia, is most famous for what is now termed the “Venturi Principle,” namely that in passing through converging pipes fluids under pressure gain speed and lose head, and vice versa for diverging pipes. The Venturi principle is now very widely adopted for metering flows in pipes, tunnels, and channels. He also performed important work on optics and color theory and this is one of his chief contributions to these subjects in which he provides a history of optics and perspective from ancient times to Huygens. At the beginning is a memoir of Bonaventura Corti (1729–1813), professor of physics in the College of Reggio and Venturi’s teacher, who discovered cyclosis in 1774. His observations were overlooked, however, and the phenomenon was rediscovered by Treviranus in 1811. Venturi here restates the original observations made by his master Corti. Fine copy in fresh condition. Signature of “R.S. Creed, Oxford, January 23, 1938” on free front endpaper. ❧ Poggendorff, II, 1193.

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