Year Book Volume 19

Year Book Volume 19

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 edition. Excerpt: ... required for the purpose, a word may be added regarding the striking phenomena rendered visible on the moon's surface by the aid of the stereoscope. The very sharp lunar photographs made at the 134-foot focus of the Hooker telescope by Mr. Pease serve admirably for this purpose when pairs representing the same phase, but differing in libration, are combined. The distinct appearance of relief thus brought out should aid materially in the solution of lunar problems. Other additions to the equipment of the Hooker telescope are in prospect, and the development of this instrument has already advanced so far that we are now able to complete the details of our general research program, some of the chief elements of which were indicated in the last annual report. While considering the most promising lines of attack on stars and nebulae, the possibilities of the solar and laboratory work have been re-examined, with the object of perfecting a homogeneous and well-balanced general scheme. In this connection the completion of the remodeled Snow telescope and its accessories for work with the Fabry-Perot interferometer, and the addition of several important instruments to our laboratory equipment, have been essential factors. Full details of the work of the year may be found in the body of this report, but the chief investigations in progress may be briefly summarized here. Of exceptional current interest is the bearing of the solar wave-length determinations of Messrs. St. John and Babcock on the generalized theory of relativity. It will be recalled that the careful investigations of Mr. St. John have failed to show a systematic shift of solar lines toward the red of the magnitude predicted by Einstein. Evershed has also failed to find the more

Product details

  • Paperback | 200 pages
  • 189 x 246 x 11mm | 367g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236650549
  • 9781236650542