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Humboldt Library of Science Volume 18

Humboldt Library of Science Volume 18


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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. 1881 Excerpt: ...Stick on to the glass by sealing-wax two loops of narrow silk ribbon, by which the pane may be lifted; and then lay smoothly upon the glass a second sheet of tin-foil, less than the pane in size, leaving a rim of uncovered glass all round. Carry a fine wire from the upper sheet of tin-foil to your electroscope. A little weight will keep the end of the wire attached to the tin-foil. Rub this weight with your excited glass tube, two or three times if necessary, until you see a slight divergence of the Dutch metal leaves. Or connecting the weight with the conductor of your machine, turn very carefully until the slight divergence is observed. What is the condition of things here? You have poured, say positive electricity on to the upper sheet of metal. It acts inductively across the glass upon the under sheet, the positive fluid of which escapes to the earth, leaving the negative behind. You see before your mind's eye two layers holding each other in bondage. Now take hold of your loops and lift the glass plate, so as to separate the upper tin-foil from the lower. What would you ex pect to occur? Freed from the grasp of the lower layer, the electricity of the upper one will diffuse itself over the electroscope so promptly and powerfully, that if you are not careful you will destroy the instrument by the mutual repulsion of its leaves. Practise this experiment, which is a very old one of mine, by lowering and lifting the glass plate, and observing the corresponding rhythmic action of the leaves of the electroscope. Common tin-plate may be used in this experiment instead of tin-foil, and a sheet of vulcanized india-rubber instead of the pane of glass. Or simpler still, for the tin-foil a sheet of common unwarmed foolscap may be employed. Satisfy yourself of this....


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Product Details
  • ISBN-13: 9781236117106
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 34
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1236117107
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 82 gr


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