McDonald Observatory
| Title | McDonald Observatory |
| View | Mirror Preparation 3 |
| Series | II: Buildings and Grounds |
| Description | A technician grinds and polishes the 82-inch mirror for the McDonald Observatory reflector telescope. The cutting tool used weighed 2,300 lbs. The process of accurately finishing the mirror's concave surface took over four years. Its curvature, which was tested at regular intervals using polarized light rays, deviates less than one-millionth of an inch, making it the most accurate large mirror ever tested. Carl A. R. Lundin (center), Warner & Swasey's optical department director designed the machinery; he is pictured with an unidentified worker (left) and the company's late director of engineering Edward P. Burrell. |
| Subject Terms | Lundin, Carl Axel Robert, 1882-1962 | Burrell, Edward P., died 1937 | Mirrors--Design and construction | Reflecting telescopes | Manufacturing processes | Warner & Swasey Company |
| Photographer | Warner & Swasey Company |
| Photograph Date | 1939 |
| Physical Format | Photographic prints; 19.3 x 24.0 cm |
| Location | Cleveland, Ohio |
| Collection | Archival Photographic Files |
| Repository | University of Chicago Library, Special Collections Research Center |
| Image Identifier | apf2-05088 |
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