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Mining and Metallurgy Volume 103-108; Published Monthly by the American Institute of Mining and Metallurgical Engineers

Mining and Metallurgy Volume 103-108; Published Monthly by the American Institute of Mining and Metallurgical Engineers


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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. 1915 Excerpt: ...but occasionally it is found advisable to have accurate determinations made on several samples of mine air. Fig. 9.--Outline Op Mechanical Ventilation System Op Lowell And Sac Hamento Mines. Averages Plotted on the Mine Map The data secured as explained in the paragraph on "Recording of Data" were averaged every week. Blueprints of the different levels of the mine were made and the monthly averages written on them in their proper places. The direction of air currents was also indicated by arrows, especially where readings were made with the anemometer. Amount of Air Necessary for Each District Calculated In order to calculate the amount of air necessary for each district, it was necessary to take into account the following: 1. Number of men and animals in each district. 2. The production of COs, or other gases, as shown by the chemical analyses. 3. Relative humidity. 4. Temperature. 5. Amount of explosives used. 6. The distance from currents of good air. 7. The number of lights. 8. Air leakage. 9. Friction of the air currents. 10. Number of splits of the air current. 11. Method of distribution. Natural Ventilation Utilized Where Possible In order to get the most economical system, it was necessary to utilize all possible natural ventilation and secure the proper distribution of the air. The latter is extremely important because the efficiency'of the ventilating system depends largely on the proper distribution of the air currents. The arrangement of air currents by mechanical means was designed to coincide with that of natural ventilation in nearly all cases. Natural Ventilation Supplemented by Mechanical Means In the divisions where natural ventilation was not sufficient, the natural air currents were strengthened by mechanical, or artificial mea...


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Product Details
  • ISBN-13: 9781130842104
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 376
  • Spine Width: 20 mm
  • Width: 189 mm
  • ISBN-10: 113084210X
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 671 gr


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Mining and Metallurgy Volume 103-108; Published Monthly by the American Institute of Mining and Metallurgical Engineers
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