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An Analysis of a Course of Lectures on the Principles of Natural Philosophy; Read in the University of Cambridge

An Analysis of a Course of Lectures on the Principles of Natural Philosophy; Read in the University of Cambridge


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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. 1784. Excerpt: ... Suppose the aperture circular, and consequently the pencils of rays which flow through it cylindrical. The images which are formed by lenses consist of points, being the vertexes of cones or pyramids of rays. The image described in the article, consists of the bases of cylinders because the rays which flow through the small aperture are all cylindrical: but the aperture being in a physical sense evanescent, the breadth of these cylinders will be evanescent, and consequently they will have t e efsect of points in forming a well-desined image. This experiment and the explanation of it will be precisely the fame, isa very small aperture of any shape Is used instead of that which is circular; the image always consisting of the bases of prisms, which will approach more nearly to points the smaller the aperture which is made use of. The solar rays are always supposed to pass through the apertures in a direction perpendicular tp their planes. XXXVIII. The diameter of the solar image is to its distance from the aperture, as twice the sine of the fun's apparent semidiameter. to radius. If the distance of the image from the aperture is 18 feet, the diameter of the solar image will be about two inches. It must be remarked concerning the experiments on solar rays, that a speculum is necessary for turning the' rays out of their course into any direction which may be required. The image formed by the solar rays which flow through a very small aperture may be termed, for-the sake of distinction, the correct image, being of a given magnitude when the distance from the aperture is known, and better desined than when a larger aperture is used, -psed, which is necessary foF the ensuing prismatic experiments; more light being required for making them than is transmitted ...


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Product Details
  • ISBN-13: 9781235689338
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 40
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1235689336
  • Publisher Date: 01 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 91 gr


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An Analysis of a Course of Lectures on the Principles of Natural Philosophy; Read in the University of Cambridge
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An Analysis of a Course of Lectures on the Principles of Natural Philosophy; Read in the University of Cambridge
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