Einstein

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[EINSTEIN, ALBERT]. EDDINGTON, ARTHUR SABAA

Report on the Relativity Theory of Gravitation

1918Best.-Nr. 2839London: Fleetway Press 1918. FIRST EDITION. Original wrappers. Fine. THE FIRST INTRODUCTION OF EINSTEIN'S GENERAL RELATIVITY TO THE ENGLISH-SPEAKING WORLD. The groundbreaking first edition 1918 with the second edition 1920 containing the account of Eddington's 1919 expedition proving Einstein's theory both in original wrappers. "Einstein's discovery of the General Theory of Relativity was communicated to the Berlin Academy of Sciences in 1915. Because of the First World War direct communication with physicists in Germany was not possible but the papers were forwarded to Eddington who was then Secretary of the Royal Astronomical Society by Willem de Sitter a personal friend of Eddington's in neutral Holland. The theory is of considerable mathematical complexity but as Einstein stated in the last paragraph of his paper 'scarcely anyone who has fully understood this theory can escape from its magic'. Eddington was the ideal expositor of these ideas in English and within 2 years had written his Report on the Relativity Theory of Gravitation for the Physical Society of London" Malcolm Longair "Bending Space-time". The second edition is notable for containing a new preface that discusses the results of the "eclipse expedition" led by Eddington that verified General Relativity and catapulted Einstein into world-wide fame. This preface precedes Eddington's full report in the Philosophical Transactions. Provenance: Almost certainly Nobel Prize winning physicist's Charles Glover Barkla's copy of the 1918 report with an original 1918 receipt in Barkla's name laid in. Barkla won the 1917 Nobel Prize in Physics "for his discovery of the characteristic Röntgen radiation of the elements". London: Fleetway Press for The Physical Society of London 1918 and 1920. Octavo original wrappers; custom box. General light wear to wrappers. Beautiful copies. RARE. Fleetway Press unknown books

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[EINSTEIN] Henri BERGSONBiblio.com

A highly significant letter on the issues and interpretation of the theory of relativity - An intervention of the philosopher continues up to this day to generate multiple controversies

1922Best.-Nr. Bergson2EINSTEIN BERGSON Henri 1859-1941 Autograph letter signed " Henri Bergson " to Jean Becquerel Paris 24 September 1922 16 pages in-8° with envelope Some typographic pencil notes A highly significant letter on the issues and interpretation of the theory of relativity This intervention of the philosopher continues up to this day to create multiple controversies We transcribe here only a few fragments of this letter which although known in its substance has remained unpublished to this day " Monsieur et cher collègue J'ai bien tardé à répondre à la lettre si intéressante et si importante que vous avez bien voulu m'adresser. C'est qu'elle est allée me chercher de divers côtés et m'a atteint en Suisse à un moment où j'étais pris à Genève par le travail de " Coopération intellectuelle " qui nous avait été confié par la Société des nations. Me voici de retour à Paris ; je profite de mes premiers instants de liberté pour vous écrire. Le passage essentiel de votre lettre est naturellement celui qui concerne le voyage en boulet. Laissez-moi reprendre ce que j'ai dit dans mon livre Durée et simultanéité paru à l'été 1922 en y joignant quelques explications complémentaires. Il y a d'abord deux remarques importantes à faire. 1° Si l'on se place en dehors de la Théorie de la Relativité on conçoit un mouvement absolu et par là même une immobilité absolue ; il y aura dans l'univers des systèmes réellement immobiles. Mais si l'on pose que tout mouvement est relatif que devient l'immobilité Ce sera l'état du système de référence je veux dire du système où le physicien se suppose placé à l'intérieur duquel il se voit prenant des mesures et auquel il rapporte tous les points de l'univers. … 2° Si l'on se place en dehors de la Théorie de la Relativité on conçoit très bien un personnage Pierre absolument immobile au point A à côté d'un canon absolument immobile ; on conçoit aussi un personnage Paul intérieur à un boulet qui est lancé loin de Pierre se mouvant en ligne droite d'un mouvement uniforme absolu vers le point B et revenant ensuite en ligne droite et d'un mouvement uniforme absolu encore au point A. Mais du point de vue de la Théorie de la Relativité il n'y a plus de mouvement absolu ni d'immobilité absolue … Paul une fois lancé dans l'espace n'est plus qu'une représentation de l'esprit une image — ce que j'ai appelé un " fantôme " ou encore une " marionnette vide ". C'est ce Paul en route ni vivant ni conscient n'existant plus que comme image qui est dans un Temps plus lent que celui de Pierre. … Le Paul qui sort du boulet au retour du voyage le Paul qui fait de nouveau partie alors du système de Pierre est quelque chose comme un personnage qui sortirait en chair et en os de la toile où il était représenté en peinture : c'était à la peinture et non pas au personnage c'était à Paul référé et non pas à Paul référant que s'appliquaient les raisonnements et les calculs de Pierre pendant que Paul était en voyage. … Je ne voudrais pas clore sans saisir l'occasion qui s'offre à moi de vous dire combien m'a intéressé et instruit votre beau livre sur " Le principe de relativité " et la " Théorie de la gravitation " – livre indispensable à tous ceux qui ont le souci d'approfondir la théorie d'Einstein. Veuillez Monsieur et cher collègue agréer l'expression de mes sentiments les plus distingués et dévoués H. Bergson " In publishing Durée et simultanéité published by Alcan in the summer of 1922 Bergson was taking a risk that he probably did not measure himself. The purpose of this essay was to discuss the philosophical issues of the theory of relativity. The criticism of his scientific colleagues was not long in coming. Those of Einstein in the first place deploring the "blunders" or "dumplings" of the philosopher. In France it was Jean Becquerel who opened fire with a letter addressed directly to the author and of which this document constitutes the reply. At the time Becquerel held a chair of applied physics at the Museum of Natural History. He wrote a textbook entitled Le Principe de relativité et la théorie de la gravitation Gauthier-Villars 1922 which made him one of the first introducers of Einsteinian theory in the French context. Two sources give an idea of the content of Becrerel's letter: his article published the following year "Critique de l'ouvrage durée et Simultaneity de M. Bergson" Bulletin scientifique des étudiants de Paris 10 2 March-April 1923 and the extract given by Bergson himself in the first of three appendices added to the 1923 edition of Durée et simultanéité – appendix which also contains with a few lines the entirety of his answer. Bergson then chose to preserve the anonymity of his correspondent in order to avoid giving the impression of a "polemic" according to the interview of December 30 1923 with Jacques Chevalier. He merely evokes "a letter very interesting which was addressed to us by a most distinguished physicist." The discussion crystallizes on a specific point: the interpretation of the slowdown of moving clocks predicted by the theory. The famous "twin paradox" attributed to Paul Langevin provides a pictorial version of the problem as part of a Jules Verne-style narrative: an astronaut here "Paul" embarked on a "ball journey" would find himself on his return younger than his twin brother who remained on Earth here "Pierre" as if time had passed less quickly for him! In his letter Becquerel insists on the fact that the theory of relativity speaks of time actually measured on both sides by observers in relative motion. Bergson repeats by clarifying it the argument developed in his book namely that the differences relate less to real times than to fictitious times that is to say times attributed to other observers who acquire at the same time the status of simple images or "ghosts". Thus the "dilation" of durations associated with the slowing down of moving clocks is only a "perspective effect". Bergson is led to this conclusion by a strict interpretation of the principle of relativity: between two observers in relative motion there is a "perfect symmetry" each can consider itself motionless or mobile with respect to the other. Multiple empirical confirmations have since objectively proved the philosopher wrong but the question of the status of time in relativity as well as that of the relevance of the arguments exchanged continues to fuel contemporary philosophical debates. In that sense that letter constitutes a key part of the case. We thank Mr. Elie During for the information he kindly communicated to us

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