. 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. FiG. 2—Surf-boat used in landing eclipse li(.. 3—Palm-thatched huts in the cocoanut XIV. Flint Island. A Total Eclipse of the Sun 67 Ever since the eclipse of 1893, the chief photographic tele-scope used on our expeditions has been of the tower formdevised and used at that time by Astronomer Schaeberle of theLick Observatory, at Mina Bronces, Chile. Obviously it is notpossible to transport to eclipse sta
. 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. FiG. 2—Surf-boat used in landing eclipse li(.. 3—Palm-thatched huts in the cocoanut XIV. Flint Island. A Total Eclipse of the Sun 67 Ever since the eclipse of 1893, the chief photographic tele-scope used on our expeditions has been of the tower formdevised and used at that time by Astronomer Schaeberle of theLick Observatory, at Mina Bronces, Chile. Obviously it is notpossible to transport to eclipse stations such massive instru-ments as those used in fixed observatories at the present day;and the small portable equatorials used at eclipses before 1893give images of the Sun too small to permit satisfactory studyof the finer details of the coronal structure. What is wantedis an instrument of very long focus which will give a solarimage four or more inches in diameter, and which will, at thesame time, be easy to transport and erect. These requirementsthe Schaeberle form of telescope, especially as improved in itsmounting by Campbell, meets admirably. Its essential parts are a lens of 40-foot focal length, givinga
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectastronomy, bookyear19
