Jacobus Cornelius Kapteyn and his secretary on Mount Wilson. Photograph copied from a book. Below the photograph is a caption in Dutch: "De professor en zijn secretaris". In the image, Kapteyn is seated in a chair, and is wearing a suit. His female secretary, wearing a dress, is also seated and is writing at a small wooden table. The two are seated outside, with plants and ivy in the background. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
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