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