Albert Einstein and Ferdinand Ellerman at the focus of the 150-foot tower telescope, Mount Wilson Observatory. Both men are wearing suits and hats. Some of the gearing and machinery for operating the telescope is seen above their heads. 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.