Keywords: Michelson's 1879 Refinement of Foucault.png en Michelson's 1879 repetition of Foucault's speed of light determination incorporated several improvements enabling use of a much longer light path 1880-02-20 http //www gutenberg org/files/11753/11753-h/11753-h htm Albert A Michelson other versions PD-old-70-1923 Uploaded with UploadWizard Speed of light Physics |