A Description of the First or Aswan Cataract of the Nile
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A Description of the First or Aswan Cataract of the Nile

A Description of the First or Aswan Cataract of the Nile


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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. 1907 edition. Excerpt: ... appear like flashing diamonds, rubies and emeralds. The sizing of the grains is very uniform, running water being even more efficient as a sizing agent than the wind. An interesting observation may be made when the river is low and its surface slightly agitated by the wind; at such times there frequently extends a narrow band of dark leaden-grey metallic-looking sand, covering the surface of the bank a few centimetres from the average water-fine. If this be scraped off and dried, it will be found to be strongly magnetic, and consists, in fact, as its specific gravity and a microscopic examination tell us, of magnetite. At certain times one may select a bucketful of nearly pure magnetite in a few minutes by scraping the surface of the low shelving bank in this way. The sandbank which formed on the east side of Philoe in the summer of 1902 yielded an abundant supply, but probably any other of the Cataract islands would do equally well. The separation is due to the gentle lapping of the water over the surface of the bank, whereby the lighter minerals are slowly washed out and the magnetite is left at the extreme limit touched by the water. A similar separation of hornblende may be noticed at some points, but is less marked owing to the lower density of that mineral as compared with magnetite. By Nile mud is signified that material, brought down in suspension and deposited by the Nile, which coheres on drying into a tough solid mass. It embraces all the finer material which is deposited from still or slowly flowing water in natural pools, artificial basins, or canals. While the river-sand last described is firm to the foot immediately after deposition, Nile mud when freshly deposited is a soft, sticky mass into which one easily sinks....


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Product Details
  • ISBN-13: 9781230158778
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 44
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1230158774
  • Publisher Date: 13 Sep 2013
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 95 gr


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