Miscellaneous Works of the Late Thomas Young Volume 1

Miscellaneous Works of the Late Thomas Young Volume 1

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1855 edition. Excerpt: ...and it is easily shown that, if we suppose two portions of light to be reflected upon the opposite edges of the furrow, the difference of their paths must vary in that proportion. Dr. Young had conjectured that the colours of the integuments of some of the coleopterous insects might be derived from furrows of this nature; but the conjecture has not been verified by observation. Dr. Brewster has, however, very unexpectedly discovered that some similar inequalities are the cause of the colours exhibited by mother of pearl; and he has confirmed the observation by showing that impressions of the surface of this substance, taken in black wax, in a hard cement, or in fusible metal, will often exhibit a similar appearance. Vhere the form of the surface of the mother of pearl is the most regular, it reflects, in an oblique light, a white image of a luminous object, like that which any other polished substance affords; but on one side of this image only, and at some little distance from it, we may observe the first order of recurrent colours, beginning fiom violet, and occasioned in all probability by the reflections from one side only of an infinite number of parallel striae, formed by the terminations of a minute lamellated structure, nearly, but not perfectly perpendicular to the general surface; one side only of each of the little furrows being situated in such a direction as to reflect an image of the luminous object to the eye, and at such a distance that the whole may constitute a regular series of equal intervals. By transmitted light this substance generally appears of a red or a green colour, changing more or less according to tl1e obliquity, and apparently belonging to some of the higher orders of recurrent colours. Dr. Young has...
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Product details

  • Paperback | 204 pages
  • 189 x 246 x 11mm | 372g
  • United States
  • English
  • black & white illustrations
  • 1236929098
  • 9781236929099