Talk:Emil Cohn

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Cohn didn't accept the ether?[edit]

Where exactly is it written or said that Cohn didn't believe in the existence of the ether? I can't believe that he said so before Einstein... —Preceding unsigned comment added by 77.3.114.79 (talk) 20:23, 13 July 2008 (UTC)[reply]

Regarding Cohn's rejection of the ether see the sources in the article (Miller, Darrigol, Janssen/Stachel). The relevant paper of Cohn is "Über die Gleichungen des elektromagnetischen Feldes für bewegte Körper" (1901). On p. 75 he wrote that one can define a vacuum, but not an ether. On p. 99 he identified the "ether" with the fixed stars. So he abandoned the classical, light carrying ether and called the ether a "metaphorical term".. --D.H (talk) 08:48, 14 July 2008 (UTC)[reply]

Picture[edit]

The only portrait of Emil Cohn (1884) I found is at the Bibliothèque nationale et universitaire (Strasbourg). Their Reproduction and printing page mentions a fee for publishing that photograph on the Internet, and a mention, which probably break Wikipedia's licensing terms. Can't Wikipedia get some kind of agreement with such kind of institutions? ale (talk) 11:49, 14 January 2013 (UTC)[reply]