Microscopic Illustrations of a Few New, Popular, and Diverting Living Objects

Microscopic Illustrations of a Few New, Popular, and Diverting Living Objects

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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. 1830 edition. Excerpt: ... pull-out tube, so as to permit it to adapt itself to rays which are considerably divergent, the term Engiscope has already been applied by Martin and others, but I think most unwarrantably, for such an execrable piece of trumpery is wholly unworthy of a separate existence, or a separate name; it is just as easy to make a piece of velvet of an ass's hide as to make an object glass, which shall answer both for a telescope and a compound microscope, be its focus what it may. The only veritable engiscope is the latter instrument, with an objective glass truly adapted to act with divergent rays; a short telescope may be made of six inches focus, and a long compound microscope, with an object glass also of six inches focus, but the construction of each must be utterly different, or they will only nominally be what they are called. I therefore hope that I shall be allowed (as I have re jbrmed and revolutionized both the optical and mechanical structure of microscopes) to change their names also, and shall therefore take the liberty of using the term engiscope, as aforesaid, instead of compound microscope, and retaining the expressions microscope or simple microscope, for convenience sake, to denominate what is now called a single microscope, in opposition to a compound. The term compound microscope will then be applied appositely to all those instruments with which we view real objects instead of images of them, constructed by combining two or more lenses together; for the optical part of what is commonly called a single microscope may be made of as many as four glasses, whereas the optical part of a compound (as it is usually termed) does not necessarily consist of more than two, viz., an object and ocular glass. Thus if we retain the...show more

Product details

  • Paperback | 28 pages
  • 189 x 246 x 2mm | 68g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236922824
  • 9781236922823