The Adolfo Stahl lectures in astronomy, delivered in San Francisco, California, in 1916-17 and 1917-18, under the auspices of the Astronomical Society of the Pacific (1919)
Astronomical Society of the Pacific, Aitken, Robert Grant, 1864-1951 · San Francisco Stanford University Press · leaf 280
Fig. 1—In Orion (5^ 36.0^:—2° 27). … Fig. 2—In Sagittarius (17^ 56.6;—27° 50). PLATE XLV. Dark Nebulae.Photographs by H. D. Curtis, Crossley Reflector. News from the Stars 169 brightness lasts for a few days or hours only and is followedby a more or less gradual decline which often proceeds to thepoint of absolute invisibility: and…
Astronomy
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
