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Description: | Medium level (H) calcium vapour, surrounding the great sun-spot of 1903, October 10, 9h. 39m. C.S.T. slit at 3966.5, suns diam = .77 metre, taken with the Rumford spectroheliograph and 40-inch refractor of the Yerkes Observatory by G.E. Hale and F. Ellerman | License: | http://creativecommons.org/licenses/by-nc-sa/2.5/ | Subjects: | black-and-white prints (photographs) Sun sun spots astrophotographs | Temporal: | 1903 | Source: | Science Museum | Creator: | Yerkes Observatory | Identifier: | 1912-420 | Go to resource |
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