(Left to right): Rudolf Ribbens, Stephen Doro, and Fred O'Neill in the Mount Wilson Observatory's machine shop, Pasadena. Ribbens is wearing a necktie with his shirt and pants; Doro and O'Neil are wearing aprons over their clothing. Several machines are partially visible behind the three men. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
If you're wondering about permissions and what you can do with this item, a good starting point is the "rights information" on this page. See our terms of use for more tips.
Share your story
Has Calisphere helped you advance your research, complete a project, or find something meaningful? We'd love to hear about it; please send us a message.