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Humboldt Library of Science Volume 99

Humboldt Library of Science Volume 99


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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. 1888 Excerpt: ...more readily along the faces of the crystals than in any other direction, and when such is the case the substance is said to have a crystalline cleavage. Frequently the-crystalline form is obvious on the surface, and even where this is not the case there are other ways, besides that of cleavage, by which it maybe detected. It must not be supposed that all crystals are of the same type as those of snow and ice. The different tvpes are indeed very numerous, but there are a few great facts which have been shown to hold good of all crystals, and to one or two of these it will be worth while to direct attention. In the first place, all crystals have either three or four primary "axes" to which their form is related. To understand what is meant by the axes of crystals and how their form is related to them is important. The axes are imaginary lines intersecting one another in the middle point of the crystal, and so situated that by following them we can conceive the crystal as divided up into a number of similar parts--four when there are three axes, and six when there are four axes. Thus, if we take a crystal with three axes and imagine it to be divided into two by a plane passing from top to bottom along one axis, and from end to end along a second, then the third will be divided into halves; and if each half of the crystal be next divided into halves by planes passing through half of the third axis, then we shall have the crystal divided into four parts exactly equal in size and exactly similar in form. We thus see that the axes are lines with reference to which the parts of a crystal are symmetrically arranged. Secondly, all crystals of the same kind, that is, formed by solidification of the same substance under the same conditions have the relative...


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Product Details
  • ISBN-13: 9781130861242
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 34
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1130861244
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 82 gr


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