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Home > Mathematics and Science books > Science: general issues > An Introduction to Physical Measurements; With Appendices on Absolute Electrical Measurements, Etc
An Introduction to Physical Measurements; With Appendices on Absolute Electrical Measurements, Etc

An Introduction to Physical Measurements; With Appendices on Absolute Electrical Measurements, Etc


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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. 1891 Excerpt: ...of the index, appears bright. The number of degrees through which the index must be turned to the right (in the direction of the hands of a watch), that the centre of the field may be dark again, is the required angle of rotation a. If we intend the zero of the circle to be also the point from which the angle is measured, the index is put to the zero without any sugar solution, and the farther Mcol turned until the centre of the field is dark. There are always two positions where the darkening takes place, 180 distant from each other. II. Wiltfs Polaristrooometer. In this instrument bands are seen in the field of view, which are bright and dark with homogeneous (sodium) light, but coloured when white light is used. The eye-piece is first so far pulled out that the bands are as sharp as possible. The adjustment for saccharimetry is, just as in I. for the darkening of the field, so here for the disappearance of the bands in the middle of the field of view. Since it is the Nicol's prism nearest to the eye which is turned, the rotation, as seen by the eye, must be taken in the direction contrary to that of the hands of a watch. The bands disappear in four positions, 90 from each other. The measurement is made more accurate by observing in all the four quadrants, both with and without the sugarsolution. The question which sometimes arises whether, the angle of rotation a is greater or less than 90, may be answered by making an approximate determination of the specific gravity and the use of Table 3, or else by making a second observation with a tube of a different length. The instruments frequently have a second graduation, which, when using a tube 200 mm. long, gives at once the sugar contained in 1 litre of the solution in grammes. It is sufficiently evident h...


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Product Details
  • ISBN-13: 9781236247643
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 68
  • Spine Width: 4 mm
  • Width: 189 mm
  • ISBN-10: 1236247647
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 141 gr


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An Introduction to Physical Measurements; With Appendices on Absolute Electrical Measurements, Etc
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