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The Observatory Volume 26

The Observatory Volume 26


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About the Book

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. 1903 Excerpt: ...and everywhere since telescopes have been in use, and which has seemed so insurmountable that I believe it lias hardly ever been thought of as subject to correction. Hitherto it has been the endeavour of astronomers, so far as I know, to secure a more tranquil image by keeping the air in the telescope-tube, through which the rays pass, as quiet as possible, and for this purpose the walls of the tube have been made nonconducting, and extreme pains have been taken not to set up currents in the tube. With these precautions the "seeing" is perhaps a little better (but very little) than if none were used at all, the main difficulty haviug been always found insurmountable. I have been led for some years to consider the conditions under which this "boiling" presents itself. It is not necessarily due to a high temperature of the external air, for the most perfect definition I have ever seen of any terrestrial object was obtained by me long since in the Harvard College Observatory at Cambridge, with its great equatorial telescope, when, on the hottest day that 1 ever knew in a Xew England summer, I directed it with a high power on the distant "south mark," which I expected to find almost indistinguishable from the "boiling." I remember my extreme surprise when, under a magnifying-power of 300, I found the image as still as the lines of an engraving. This was an extraordinary exception to ordinary experience, and led me to take an interest in the subject. I have since pursued an inquiry to which this circumstance first directed my attention, and I have done so at all altitudes, at one time residing on Aetna for this purpose, noting that even on high mountains telescopic vision was so far from being always clear that it was some...


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Product Details
  • ISBN-13: 9781231166000
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 198
  • Spine Width: 11 mm
  • Width: 189 mm
  • ISBN-10: 1231166002
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 363 gr


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