Yerkes Observatory
| Title | Yerkes Observatory |
| View | Astronomical photographs 2 |
| Series | II: Buildings and Grounds |
| Description | Calcium spectroheliogram (top) compared with a hydrogen spectroheliogram (bottom), the latter showing oppositely directed vortices in the two hemispheres. Taken at Yerkes Observatory, August 31, 1908. |
| Subject Terms | Sun | Spectroheliograms | Astronomical photography | Astronomical spectroscopy |
| Photograph Date | 1908-08-31 |
| Physical Format | Photographic prints; 22.3 x 16.1 cm |
| Collection | Archival Photographic Files |
| Repository | University of Chicago Library, Special Collections Research Center |
| Image Identifier | apf2-08913 |
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