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On Microscopical Manipulation, the Subject-Matter of Lectures

On Microscopical Manipulation, the Subject-Matter of Lectures


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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. 1870 Excerpt: ...which is necessary when the paraboloid is used with the higher powers, the stop in that case being pushed up as far as it will gg. A well constructed paraboloid is capable of giving a black field with a Jth of 100 of aperture. The paraboloid is superior to the spotted lens on account of its freedom from chromatic and spherical aberration, and also from its larger angle, which is about 127, while the angle of the spotted lens is a little under 90. The spotted lens, however, can be used with advantage in examining objects which have a degree of transparency which would prevent their perfect observation with the paraboloid, this latter illuminator being better suited for the examination of semi-opaque or translucent tissues. Black field illumination, like that by reflected light, is perhaps more free from the deceptive appearances which so frequently lead to errors of interpretation, and one or both of these modes of lighting should always be employed when practicable. As the amount of light stopped by the object depends in some degree upon its opacity, the relative density of the various parts may be fairly judged of by their respective brilliancy. Dark field illuminators aid very much in the production of stereoscopic effect, no methods of illumination, save those by reflected light, giving such correct views of the relative position in depth of the various parts of an objedt, with an advantage peculiar to themselves of revealing internal structure to a great extent. In the old microscopes, constructed before the introduction of the achromatic principle, the want of light was very evident when any but the lowest powers were used; this soon led to the employment of some means of increasing the intensity of the illumination. The usual plan was to place a lens ...


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Product Details
  • ISBN-13: 9781130102130
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 56
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1130102130
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 118 gr

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