‎SAVART, FELIX - A MAIN WORK ON ACOUSTICS‎
‎Extrait d'un Mémoire sur les Modes de Division des Plaques vibrantes.‎

‎(Paris, Fortin, Masson et Cie, 1840). 8vo. Without wrappers. In: 'Annales de Chimie et de Physique', 2e Series, tome 73, Cahier 3. Pp. 225-336 (entire issue offered). Savart's paper: pp. 225-273 and 2 large folded engraved plates, showing 110 vibration patterns. Some browning to first and last leaf. Scattered brownspots.‎

Reference : 45033

‎First printing of Savart's importent paper on the vibration of plates in which he greatly extended the investigations done by Chladni. The paper is an abstract, but was not published otherwise.Savart made experimental studies of many phenomena involving vibration. With Biot he showed that the magnetic field produced by the current in a long, straight wire is inversely proportional to the distance from the wire. In most of his vibrational studies Savart observed the nodal lines of vibrating surfaces and solids, and he thereby obtained information on vibrational modes and elastic properties.He also greatly extended Chladni's observations of the modes of plates: adding a dye to the sand, he made prints of the nodal patterns for brass plates in the shapes of circles, ellipses, and polygons. Savart was able to locate directly the nodes of a vibrating air column by lowering a light membrane covered with sand into a vertical pipe.‎