Publisher Information: 1908-1910.
Ewald, Ernst Julius Richard (1855-1921). (1) (with G. A. Jäderholm) Die Herabsetzung der subjektiven Tonhöhe durch Steigerung der objektiven Intensität. Offprint from Archiv für die ges. Physiologie 124 (1908). 29-36pp. 236 x 162 mm. Original printed wrappers, slight discoloration at edges. Presentation Copy, Inscribed by Ewald to Ernst Mach (1838-1916) on the front wrapper: “Dem Meister in der Akustik E. Mach überreicht von J. Rich. Ewald.” (2) Über die neuen Versuche, die Angriffsstellen der von Tönen ausgehenden Schallwellen im Ohre zu lokalisieren. Offprint from Archiv für die ges. Physiologie 131 (1910). 188-198pp. 235 x 161 mm. Original printed wrappers, slight discoloration at edges. Presentation Copy, Inscribed by Ewald to Mach on the front wrapper: “Ernst Mach in grösster Verehrung vom Verf.” Together 2 items. Fine.
First Editions, Offprint Issues. Ewald, who held the chair of physiology at the University of Strasbourg, is best known for his investigations of the vestibular system of the inner ear (see Garrison-Morton 1568 and 1569). Ewald presented the above two offprints on acoustics—“The reduction of subjective pitch by increasing objective intensity” and “On new attempts to locate the points of attack of outgoing sound waves in the ear”—to physicist Ernst Mach, whom Ewald praised as the “Master of acoustics.” In the last decades of the 19th century Mach had devised and perfected optical and photographic techniques for studying sound waves; his famous acoustical studies of shock waves from bullets were published in the 1880s.Book Id: 43158