EINSTEIN, Albert (1879-1955). Autograph letter signed ("A.Einstein") to Dr Otto Halpern, n.p., 2 February 1924. In German. Two pages, 279 x 216mm, with autograph corrections (nearly separated at center fold, marginal soiling). Einstein critiques a fellow physicist: "I have found errors in two papers of yours which absolutely must be corrected, because they will otherwise cause damage." Otto Halpern (1899-1982), an Austrian theoretical physicist, had recently published papers in Annalen der Physik (1923) and Zeitschrift für Physik (1924). Over the course of two pages, the scientist addresses Halpern's errors point by point, giving the reader a glimpse of Einstein as critic. He first notes that the "derivation is incorrect, as is also the conclusion," citing a mistake in the cyclic process. Second: "Now, however, comes the main point. It is incorrect that, by a consideration as I have carried out with Mr Ehrenfest and which you give on p. 152, one can overlook the earlier observation concerning Brownian motion of the atom and therefore the hypothesis of the momentum characteristics of fundamental processes. […] In that I hope that you will correct your assertions yourself."
EINSTEIN, Albert (1879-1955). Autograph letter signed ("A.Einstein") to Dr Otto Halpern, n.p., 2 February 1924. In German. Two pages, 279 x 216mm, with autograph corrections (nearly separated at center fold, marginal soiling). Einstein critiques a fellow physicist: "I have found errors in two papers of yours which absolutely must be corrected, because they will otherwise cause damage." Otto Halpern (1899-1982), an Austrian theoretical physicist, had recently published papers in Annalen der Physik (1923) and Zeitschrift für Physik (1924). Over the course of two pages, the scientist addresses Halpern's errors point by point, giving the reader a glimpse of Einstein as critic. He first notes that the "derivation is incorrect, as is also the conclusion," citing a mistake in the cyclic process. Second: "Now, however, comes the main point. It is incorrect that, by a consideration as I have carried out with Mr Ehrenfest and which you give on p. 152, one can overlook the earlier observation concerning Brownian motion of the atom and therefore the hypothesis of the momentum characteristics of fundamental processes. […] In that I hope that you will correct your assertions yourself."
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