Opticians Alvan Graham Clark (1832-1897) and Carl A. R. Lundin of Clark & Sons pose with the 40-inch refracting lens after its delivery to the Yerkes Observatory. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
Clark, Alvan Graham (1832-1897) Lundin, Carl A. R Opticians Telescope makers Lenses Yerkes Observatory Group portraits. (gmgpc) Portrait Photographs. (aat) Photographic prints. (gmgpc)
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