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Home > Art, Film & Photography > Micrographia; Containing Practical Essays on Reflecting, Solar, Oxy-Hydrogen Gas Microscopes Micrometers Eye-Pieces, &C. &C
Micrographia; Containing Practical Essays on Reflecting, Solar, Oxy-Hydrogen Gas Microscopes Micrometers Eye-Pieces, &C. &C

Micrographia; Containing Practical Essays on Reflecting, Solar, Oxy-Hydrogen Gas Microscopes Micrometers Eye-Pieces, &C. &C


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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. 1837 edition. Excerpt: ...apparently about as great as the light of a twilight evening is to that of meridian day. Now, when we reflect that eyery polished glass surface reflects an equal quantity of light, we may wonder how we see objects at all in an instrument composed of many glasses, and may be very much inclined to think that the fewer glasses we see through, the more perfect must be our vision; that, in short, single lenses must inevitably be the best instruments after all; and such was the opinion of Leeuwenhoek and all the early microscopists. Lenses formed of gem, especially diamond, must be much darker than glass ones, from the greater reflective power of such substances, which defect, however, ought (if there be any truth in analysis) to be much more than compensated for by their high refractive and low dispersive power. Jewelled simple microscopes, then, (a priori at least), should seem, upon the whole, to stand upon the top of the scale; but as we here only consider illuminative power, they certainly occupy only the second rank, or, if coloured, as is the case with many of them (sapphire and garnets, for example), a still lower one. Doublets must of course arrest twice as much, and triplets three times as much light as single lenses formed of the same glass; and an engiscope, consisting of four, five, or six glasses, &c. four, five, or six times as much, under any given illumination. The question of the comparative light of reflecting and refracting instruments has been often agitated, and generally determined in a very unfair way by the champions on both sides. The amateurs and makers of refractors, led away by their hatred and contempt of the reflecting tribe, have gone the length of asserting that an achromatic engiscope, having a sextuple, or two...


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Product Details
  • ISBN-13: 9781150462443
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 70
  • Spine Width: 4 mm
  • Width: 189 mm
  • ISBN-10: 1150462442
  • Publisher Date: 01 Jul 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 141 gr


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