Ether drift experiment apparatus (2 views) used by Georg Joos in Jena, Germany. The caption below the top image reads: "Totalansicht des Interferometers, Fig. 6" [translation: Total view of the interferometer]. The caption below the bottom image reads: "Die Lagerung der Optik, Fig. 7" [translation: The mounting of the optics]. Photograph of a printed page. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
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