August 2019 Auction Ends Thursday, August 29th, 5pm Pacific

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This lot is closed for bidding. Bidding ended on 8/29/2019
Albert Einstein autograph letter signed, an unusual letter of reference for fellow physicist Dr. Paul Sophus Epstein. Dated 14 August 1921, Einstein writes in German in full, ''Prof. Dr. Epstein is certainly one of the most prominent living theoretical physicists of the German-speaking world. Without a doubt, he would have been appointed to a German professorship a long time ago, had his Russian nationality not stood in the way.

Among Epstein's numerous original scientific papers, two findings, which advanced the modern quantum theory in crucial ways, should be noted. After Mr. Sommerfeld, as the first physicist who, on the basis of special hypotheses, had applied the quantum theory to a certain mechanical system of more than one degree of freedom, Mr. Epstein discovered an important generalization of the quantum principle, which establishes the application of the quantum theory for all quasi-periodic mechanical systems. Based on that general application of the quantum principle, he then provided an analysis of the splitting of spectral lines in the electrical field (Stark effect), the accordance of which with the experiment provides one of the strongest supports for the Rutherford-Bohr atomic theory.

I would like to add that I have also come to appreciate Mr. Epstein in personal interactions as a human being, and that I had the pleasure of attending several scientific lectures given by him, which enabled me to convince myself of his competence in delivering clearly understandable oral exposition. / A. Einstein.''

Einstein's letter likely helped Epstein secure a teaching position in Caltech later in 1921, where he spent the remainder of his career. Single page letter measures 7.375'' x 11''. Shallow folds and creasing, else near fine condition.
Albert Einstein Autograph Letter Signed -- Einstein Writes a Letter of Recommendation for Physicist Paul Epstein, Who ''...advanced the modern quantum theory in crucial ways...''Albert Einstein Autograph Letter Signed -- Einstein Writes a Letter of Recommendation for Physicist Paul Epstein, Who ''...advanced the modern quantum theory in crucial ways...''Albert Einstein Autograph Letter Signed -- Einstein Writes a Letter of Recommendation for Physicist Paul Epstein, Who ''...advanced the modern quantum theory in crucial ways...''Albert Einstein Autograph Letter Signed -- Einstein Writes a Letter of Recommendation for Physicist Paul Epstein, Who ''...advanced the modern quantum theory in crucial ways...''
Albert Einstein Autograph Letter Signed -- Einstein Writes a Letter of Recommendation for Physicist Paul Epstein, Who ''...advanced the modern quantum theory in crucial ways...''
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Auction closed on Thursday, August 29, 2019.
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