Photograph of the hydrogen atmosphere of the sun (Ellerman)
23. Diagram showing outline of the 100-inch Hooker telescope, and path of
the two pencils of light from a star when under observation with the
20-foot Michelson interferometer
24. Twenty-foot Michelson interferometer for measuring star diameters,
attached to upper end of the skeleton tube of the 100-inch Hooker
telescope
25. The giant Betelgeuse (within the circle), familiar as the conspicuous
red star in the right shoulder of Orion (Hubble)
26. Arcturus (within the white circle), known to the Arabs as the "Lance
Bearer," and to the Chinese as the "Great Horn" or the "Palace of the
Emperors" (Hubble)
27. The giant star Antares (within the white circle), notable for its red
color in the constellation Scorpio, and named by the Greeks "A Rival
of Mars" (Hubble)
28. Diameters of the Sun, Arcturus, Betelgeuse, and Antares compared with
the orbit of Mars
29. Aldebaran, the "leader" (of the Pleiades), was also known to the Arabs
as "The Eye of the Bull," "The Heart of the Bull," and "The Great
Camel" (Hubble)
30. Solar prominences, photographed with the spectroheliograph without an
eclipse (Ellerman)
31. The 150-foot tower telescope of the Mount Wilson Observatory
32.
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