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The Elements of Natural or Experimental Philosophy

The Elements of Natural or Experimental Philosophy


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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. 1803. Excerpt: ... and of air, fg, which is intercepted between f and the perpendicular eg will be the corresponding sine to represent the refractive power of the medium b. For, since e dg (opposite to ef) is the angle of refraction, efg (opposite to ed) must be equal to the angle of incidence b dh; and ef: fg:: bd: dh:: sine of chi: sine of h b d. '" All therefore that is requisite for determining the refractive power of b, is to-find means of measuring the line fg. On this principle the instrument, fig. 15, Plate XXVIII. is constructed. On a board ab is fixed a piece of flat deal cdt to which, by a hinge at d, is jointed a second piece de, ten inches long, carrying two plane sights at its extremities. At e is a second hinge, connecting ?/15,83 inches long; and a third at the other extremity of ef by which fg is connected with it. At i also is a hinge, uniting the radius ig to the middle of ef; and then, since g moves in a semicircle egf a line joining e and g would be perpendicular to fg. "The piece cd has a cavity in the middle of ir, so that when any substance is applied to. the middle of the prism P, it may continue to rest horizontally on its extremities. When ed has been so elevated that the yellow rays in the.fringe of colours (observable where perfect reflection reminates) are seen through the sights, the point g, by means of a vernier which it carries, . shews by inspection the length of the sine of refraction sought. "The advantages which this method possefles above the usual mode of examining refractive powers, are greater than they may at first sight appear. "The facility of determining refractive powers, is consequently such as to render this property of bodies a very convenient test in many philosophical inquiries. For discovering the puricy of essential oils, ...


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Product Details
  • ISBN-13: 9781154234633
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 102
  • Spine Width: 5 mm
  • Width: 189 mm
  • ISBN-10: 1154234630
  • Publisher Date: 01 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 195 gr


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