Ludwig Louis Albert Zehnder (4 May 1854, Illnau – 24 March 1949,  Obergaufen an Thunersee was a Swiss physicist, the inventor of an interferometer in 1892. In the same years, Ludwig Mach invented also the same interferometer but it appears both physicists conducted their work independently.

Zehnder was a student in physics at the universities of Freiburg and Basle. He produced the first pictures of the human skeleton by shining x-rays through the human body.

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