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MACH, Ernst. *Die Prinzipien der physikalischen Optik. Historisch und erkenntnispsychologisch entwickelt*, Leipzig (J. A. Barth) 1921. In-8°, gilt-embossed cloth, pp. x + 444 + [ii, publisher’s list]. Stamp of Hans Bolza. A fine copy of the first edition of one of Mach’s works in which he traces the history of a science not as a subject in its own right, but for what it could contribute to contemporary science. We also offer HENNING, Hans. Ernst Mach as Philosopher, Physicist, and Psychologist, Leipzig 1915. Provenance: library of Hans and Oscar BOLZA, then passed down through the family.
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