http://www.waltherritz.ch/programme Olivier Darrigol, directeur de recherche au CNRS: "Ritz est l'auteur d'une tentative célèbre de concilier l'électrodynamique et le principe de relativité dans une théorie qui FAIT DEPENDRE LA VITESSE DE LA LUMIERE DE CELLE DE LA SOURCE."
http://www.savs.ch/fr/component/docman/doc_download/14-plaquette-du-20e-anniversaire-de-la-savs "Sa dernière année de vie est prolifique du point de vue scientifique. Sa réputation s'accroît et l'université de Zurich le considère comme le meilleur parmi 9 candidats possibles pour sa nouvelle chaire de physique théorique. Cependant, Ritz est déjà trop faible pour enseigner, et le poste est finalement donné à Einstein. En avril, Ritz reçoit la visite d'Henri Poincaré qui s'excuse au nom de l'Académie des Sciences de Paris de ne pas lui avoir attribué 2 ans plus tôt le Prix Vaillant, promettant que cette injustice serait réparée. Mais cette aide arrive trop tard. Walther Ritz, atteint de tuberculose, doit entrer à la clinique de Göttingen à la mi-mai; il y meurt 7 semaines plus tard, le 7 juillet 1909. Il a donc 31 ans."
Un jour vous devrez expliquer en français les conséquences (tragiques pour la science ?) de cette mort prématurée de Walther Ritz. Des explications en anglais, bien que partielles et insuffisantes, existent déjà:
https://webspace.utexas.edu/aam829/1/m/Relativity_files/RitzEinstein.pdf Alberto Martinez: "Two months after Ritz's death, in September 1909, his exchange with Einstein barely echoed at a meeting of the Deutsche Naturforscher und Ärtze in Salzburg, where Einstein delivered a lecture elaborating his views on the radiation problem but made no explicit reference to Ritz's views. Two years later, however, in November 1911, Paul Ehrenfest wrote a paper comparing Einstein's views on light propagation with those of Ritz. Ehrenfest noted that although both approaches involved a particulate description of light, Ritz's theory constituted a "real" emission theory (in the Newtonian sense), while Einstein's was more akin to the ether conception since it postulated that the velocity of light is independent of the velocity of its source. (...) Ritz's emission theory garnered hardly any supporters, at least none who would develop it or express support for it in print. As noted above, in 1911, two years after Ritz's death, Ehrenfest wrote a paper contrasting Ritz's and Einstein's theories, to which Einstein responded in several letters, trying in vain to convince him that the emission hypothesis should be rejected. Then Ehrenfest became Lorentz's successor at Leiden, and in his inaugural lecture in December 1912, he argued dramatically for the need to decide between Lorentz's and Einstein's theories, on the one hand, and Ritz's on the other. After 1913, however, Ehrenfest no longer advocated Ritz's theory. Ehrenfest and Ritz had been close friends since their student days, Ehrenfest having admired Ritz immensely as his superior in physics and mathematics; but following Ritz's death, Einstein came to play that role, as he and Ehrenfest became close friends."
https://webspace.utexas.edu/aam829/1/m/Relativity.html Alberto Martinez: "Does the speed of light depend on the speed of its source? Before formulating his theory of special relativity, Albert Einstein spent a few years trying to formulate a theory in which the speed of light depends on its source, just like all material projectiles. Likewise, Walter Ritz outlined such a theory, where none of the peculiar effects of Einstein's relativity would hold. By 1913 most physicists abandoned such efforts, accepting the postulate of the constancy of the speed of light. Yet five decades later all the evidence that had been said to prove that the speed of light is independent of its source had been found to be defective."