Albert Einstein and Walther Mayer at the focus of the 150-foot tower telescope, Mount Wilson Observatory. Einstein is seen leaning over the telescope's eyepiece; Mayer is standing to his left. Both men are wearing coats over their suits. What appears to be an electric switchboard is seen at the far left. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
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