‎"EINSTEIN, ALBERT.‎
‎Bemerkungen zu der Notiz von Hrn. Paul Ehrenfest: ""Die Translation deformierbarer Elektronen und der Flächensatz"".‎

‎Über die Möglichkeit einer neuen Prüfung des Relativitätsprinzips" (withbound:) Bemerkungen zu der Notiz von Hrn. Paul Ehrenfest: ""Die Translation deformierbarer Elektronen und der Flächensatz"""" (withbound:) Über die vom Relativitätsprinzip gefordert...‎

‎Leipzig, J.A. Barth, 1907. Contep. hcloth. Both hinges with a tear at upper part. ""Annalen der Physik, Vierte Folge. Band 23. Herausgegeben von W.Wien und M. Planck"", VIII,1000 pp. and 4 plates. Einstein's papers pp. 197-98 a. 206-209 a. 371-384. Internally fine and clean. The whole volume offered.‎

‎All 3 papers in first edition. - The first paper ""New possibility of testing the relativity principle"" deals with the shift of canal rays in the Dobbler effect as a possible confirmation of the Principle of Relativity - the confirmation became actual only in 1938 when new improved instrumentation made it possible. - The second paper ""remarks concerning Paul Ehrenfest's note: 'Translation of the deformable electron and the momentum law', Einstein gives his answer by relating it to his Theory of Relativity. - The third paper ""The inertia of energy, as demanded by the principle of relativity"", which is a importen paper as it i is the first to state E=mc2 in its general form. general form. This new relation which was adumbrated already in his paper of 1906 (Das prinzip von der Erhaltung der Schwerpunktsbewegung), brings about the complete unification of mass and energy into a single concept. In natural units, which make c=1, we have E=m, i.e. mass and energy are one and the same quantity. Every form of energy also has a mass value, just as every mass represents a definite amount of energy. - Weil Nos 17,18 a. 19‎