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Home > History and Archaeology > History > History of the Americas > Physical Technics; Or, Practical Instructions for Making Experiments in Physics and the Construction of Physical Apparatus with the Most Limited Means
Physical Technics; Or, Practical Instructions for Making Experiments in Physics and the Construction of Physical Apparatus with the Most Limited Means

Physical Technics; Or, Practical Instructions for Making Experiments in Physics and the Construction of Physical Apparatus with the Most Limited Means


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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. 1862 Excerpt: ...convex edge. Emery is supplied to this disk by a ring like fig. 401, and the crystalline plates are ground true on its cylindrical edge, making their surface always a little concave rather than convex, which the shape of the wheel facilitates. The plates are cemented with sealing-wax to corks in order to handle them more easily. When one surface has the proper shape and direction, remove the ring, tig. 401, and finish on the front of the wheel. The wheel must be turned very slowly and emery applied with a stick; the crystal should be moved in epicycloids over the surface of the wheel, and its surface constantly tested by a steel ruler. For polishing, the wheel must be carefully cleaned and finer emery applied, and the final polish is given with the finest emery on plate glass. As the value of the plate depends entirely on the accuracy of the grinding, one must not spare labor nor pains. Inequalities cannot bo removed in polishing, unless the substance is quite soft. Tourmalin is too hard to be ground smooth on hones of any sort, and even quartz is only slightly affected by them; with glass and other softer substances they facilitate the work very much. Such substances are polished on the polishing wheel described under the article "pendulum," with the aid of water and colcothar applied at last nearly dry. Tourmalin usually occurs in prisms, and the optic axis is, as in quartz, parallel to the length. The experiment with crossed and parallel axes may be made with any thin transparent prisms without cutting them. All other hard minerals are cut in the same way. Softer substances are ground on glass with emery, or else on a hone. A fine yellow oilstone (novaculite) is excellent for fine grinding. Calc spar is apt to crumble when rubbed on a stone or ...


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Product Details
  • ISBN-13: 9781236076267
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 138
  • Spine Width: 8 mm
  • Width: 189 mm
  • ISBN-10: 1236076265
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 259 gr


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Physical Technics; Or, Practical Instructions for Making Experiments in Physics and the Construction of Physical Apparatus with the Most Limited Means
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