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Naval Hygiene

Naval Hygiene


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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. 1918 edition. Excerpt: ...Genito-urinary (venereal) 914 Tuberculosis or suspects 657 CHAPTER XVII AVIATION Aviation has become such an important factor in military and naval operations that a brief consideration of it is warranted. Ability to attain high altitudes is desirable in time of war for the dual purpose of avoiding anti-aircraft guns and preventing discovery of the fliers. An officer who was in London during the most disastrous air raid against that city states that owing to the altitude of the invading machines they were almost invisible, and further that the motors could be heard scarcely, if at all. Battle planes are fighting now at an altitude of 19,000 to 20,000 feet. Since air pressure diminishes fairly rapidly as distance above the earth's surface increases, vertical ascents must be limited to a distance of from 2 to 3 miles unless oxygen is used. Kent says: "At the sea level the pressure of the air is 14.7 pounds per square inch; at mile above the sea level it is 14.02 pounds; at mile it is 13 33; at % mile it is 12.66; at 1 mile 12.02; at miles 11.42; at miles 10.88; at 2 miles 9.80 per square inch." 'It is a good rule to remember that pressure decreases pound per square inch for each 1000 feet of vertical distance within the range normally traversed by the aviator. This rule enables rough approximation of pressure at any altitude and gives data sufficiently definite for practical purposes. At an altitude of 18,500 feet a cubic foot of air has only half the weight of a cubic foot of air at sea level. Hydroplanes are heavy and cannot attain the same heights reached by lighter machines built for aviation on land. The practical limit of hydrbplanes today appears to be about 16,000 feet. The aviator should be selected after a most rigorous...


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Product Details
  • ISBN-13: 9781236841568
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 170
  • Spine Width: 9 mm
  • Width: 189 mm
  • ISBN-10: 1236841565
  • Publisher Date: 13 Sep 2013
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 313 gr


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