Against the Constancy of the Speed of Light
Franz Karollus to Ernst Gehrcke, 25 November 1921, reproduction

Karollus is a physics instructor at the highschool in Brünn. In an exchange of letters with the Einstein opponent Gehrcke, he discusses Einstein’s postulate about the constancy of the speed of light.

Karollus tries to prove that the speed of light is indeed variable.

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