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Bulletin of the Philosophical Society of Washington Volume 8-10

Bulletin of the Philosophical Society of Washington Volume 8-10


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About the Book

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1874 edition. Excerpt: ...exist, the latter method is usually employed. The data necessary for the computation are the latitude of the place where the weighing is made and its altitude above the sea level; the weights, Specific gravities, and coefficients of expansion of each of the substances in the two pans; the temperature of the air, its barometric pressure, and the pressure, both of the aqueous vapor, and of the carbonic anhydride, contained in it. Judging from the adjustment of the pile de Charlemagne, and the Exchequer troy weights of Queen Elizabeth, the accuracy attained in weighing gold and silver at the mints during the fourteenth, fifteenth, and sixteenth centuries must have been about one part in ten thousand. The balance which Mr. Harris of the Lon don mint used in 1743 indicated one-eighth of a grain on a troy pound, or about one part in 50,000; while according to Sir George Shuckburgh the balance used by Messrs. Harris and Bird in making their observations upon the Exchequer weights, apparently in 1758 or 1759, turned with one 230,000th part of its load.1 In 1798 Sir George Shuckburgh had a balance sensitive enough to indicate 0s01 of a grain when loaded with 16,000 grains, or about one part in 1,600,000. The balance used by Fortin in 1799, in adjusting the kilogram of the archives, was not quite so delicate, its sensitiveness being only the 1,000,000th part of its load; but in 1844, for the adjustment of the present English standard pound, Professor Miller employed a balance whose index moved about 0'01 of au inch for a change of 0'002 of a grain in a load of 7,000 grains. He read the index with a microscope, and found the probable error of a single comparison of two avoirdupois pounds to be one 12,000,000th of either, or about 0'00058 of a grain....


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Product Details
  • ISBN-13: 9781230179162
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 174
  • Spine Width: 9 mm
  • Width: 189 mm
  • ISBN-10: 123017916X
  • Publisher Date: 13 Sep 2013
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 322 gr


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