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Abstracts of the Papers Printed in the Philosophical Transactions of the Royal Society of London (Volume 1)

Abstracts of the Papers Printed in the Philosophical Transactions of the Royal Society of London (Volume 1)


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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. 1832. Excerpt: ... telescope had been made some time before the Gregorian, and its speculum had in consequence lost somewhat of its original polish. But notwithstanding this source of disadvantage on the side of the Cassegrainian, a corresponding superiority again appeared in its power of illumination. The areas of aperture were in this instance as 79 to 110; but as the magnifying powers were not equal but in the ratio of 108 to 182, it was necessary to make further allowance, in proportion to the squares of these numbers; so that the illuminating powers were found to be nearly as 3 to 2. From the mean of these experiments, and from consideration of all circumstances, the author conceives that the relative superiority of the Cassegrainian may be stated to be as 60 to 33, or 20 to 11. With respect to the probable cause of the difference thus observed, Major Kater conjectures that it may possibly depend on the mutual interference of rays meeting in the same point, which it is possible may be in great measure dissipated when received by the small speculum in the Gregorian, after crossing in the principal focus; while on the contrary, in the Cassegrainian, the loss of light from this source is avoided, since the small speculum in that construction receives the rays before they arrive at the focus, and before they become sufficiently concentrated to interfere with each other's motion. This conjecture, it is observed, derives additional support from a circumstance that has been observed with respect to refracting telescopes; namely, that in a comparison between the simple astronomical telescope and a Galilean of equal aperture and power, the satellites and belts of Jupiter may be seen much more distinctly in the latter, where the rays are received by a concave lens before their i...


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Product Details
  • ISBN-13: 9781150203343
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 252
  • Spine Width: 13 mm
  • Width: 189 mm
  • ISBN-10: 115020334X
  • Publisher Date: 01 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 458 gr


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