Alfred H. Joy at the galactic rotation exhibit, Mount Wilson Observatory. The sign at the top of the exhibit board reads "Model of galactic rotation". The sign below reads "Mount Wilson Observatory". Joy is wearing a suit, and is using a pencil as a pointer, showing a specific portion of the exhibit. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
Joy, Alfred H. (Alfred Harrison), 1882-1973 Astronomers Scientists Museum exhibits Galaxies Mount Wilson Observatory Portrait photographs Suits (Clothing) Portrait Photographs. (aat) Photographic prints. (gmgpc)
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