Leipzig und Berlin, B.G. Teubner, 1920, in-8°, Titelblatt + 52 p., H.-Leinenband. Orig.-Umschlag aufgezogen.
The first edition of Lorentz' three lectures was published by W.H. Keesom (1876-1956), with his footnotes and supplement, in 1914. “Lorentz' most important work was in optical and electromagnetic theory ... (he also) was strongly sympathetic to the general relativity theory, making fundamental contributions to it in 1914-1917... he was honored as the greatest cultural figure the Netherlands had produced in recent times” (DSB). Lorentz was rewarded the Noble price for physics in 1902, together with Pieter Zeeman. Dict. Scient. Biogr. VIII/487-500.
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