McDonald Observatory
| Title | McDonald Observatory |
| View | Electric Power Sources 2 |
| Series | II: Buildings and Grounds |
| Description | This one-third horsepower electric motor operates the perfectly balanced 75-ton telescope. An outstanding feature of the observatory is its declination-deviation control, which automatically compensates for the earth's rotation, allows for the bending of light rays striking the earth's atmosphere, and keeps the huge instrument constantly focused on stars in their flight through space. |
| Subject Terms | Astronomical observatories | Science rooms and equipment | Motors |
| Photographer | Payne, Elwood M. |
| Photograph Date | 1939 |
| Physical Format | Photographic prints; 24.3 x 19.1 cm |
| Location | Davis Mountains, Texas |
| Collection | Archival Photographic Files |
| Repository | University of Chicago Library, Special Collections Research Center |
| Image Identifier | apf2-05073 |
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