Walther Mayer and Albert Einstein standing next to the Monastery porch, Mount Wilson Observatory. The Monastery served as a dormitory for visiting scientists. Both Mayer and Einstein are wearing suits and neckties. Mayer is also wearing a pocket watch. Some of the porch columns can be seen behind them. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
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