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Identifier: microscopeint00gage (find matches)
Title: The microscope; an introduction to microscopic methods and to histology
Year: 1901 (1900s)
Authors: Gage, Simon Henry, 1851-1944
Subjects: Microscopy Microscopes
Publisher: Ithaca, N.Y. Comstock publishing company

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Tzer. Cross theNicols. In the dark field will be seen multitudes of shining crystals,and if the preparation is a fresh one in water, part of the smallercrystals will alternately flash and disappear. By observing carefully,some of the larger crystals will be found to remain dark with crossedNicols, others will shine continuously. If the crystals are in such aposition that the light passes through them parallel with the optic Fig. 126. ChamoVs Microscopefor Micro-Chemical Analysis (Jour-nal of Applied Microscopy\ 1899, p. 503. This is a modified and simplified pelrographical microscope and hasall the attachments and motions nec-essary for micro-chemical analysis.As the objects studied are mostlyliquid or in liquids the microscopehas no joint as it must be used in avertical position.
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154 MICRO-SPECTROSCOPE AND POLAR/SCOPE \_CH. VI axis,* the crystals are isotropic like salt crystals and remain dark.If, however, the light traverses them in any other direction the rayfrom the polarizer is divided into two constituents vibrating in planesat right angles to each other, and one of these will traverse the an-alyzer, hence such crystals will appear as if self-luminous in a darkfield. The experiment with these crystals from the frog succeeds wellwith a 2 mm. homogeneous immersion. As a further illustration of anisotropic objects, mount some cottonfibers in balsam (§ 256), also some of the lens paper (§ 114;. Thesefurnish excellent examples of vegetable fibers. Striated muscle fibers are also very well adapted for polarizingobjects. As examples of biaxial crystals, allow some borax solution to dryand oystallize on a slide ; use the crystals as objects. As all doublyrefracting objects restore the light with crossed Nicols, they are some-times called depolarizing. (C) Pleo

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Author Gage, Simon Henry, 1851-1944
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  • bookid:microscopeint00gage
  • bookyear:1901
  • bookdecade:1900
  • bookcentury:1900
  • bookauthor:Gage__Simon_Henry__1851_1944
  • booksubject:Microscopy
  • booksubject:Microscopes
  • bookpublisher:Ithaca__N_Y__Comstock_publishing_company
  • bookcontributor:Smithsonian_Libraries
  • booksponsor:Biodiversity_Heritage_Library
  • bookleafnumber:168
  • bookcollection:biodiversity
  • BHL Collection
  • BHL Consortium
Flickr posted date
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29 July 2014


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