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Report of the Results Obtained with Experimental Filters at the Pettaconset Pumping Station of the Providence Water Works

Report of the Results Obtained with Experimental Filters at the Pettaconset Pumping Station of the Providence Water Works


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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. 1896 Excerpt: ...98.9 Morison Mechanical Filter Less 00.3 per cent. Natural Filters at Lawrence, Mass. Average of the Average Percentages of Removal, given in the Tenth column of the first part of table No. 22, not inclosed in parentheses, 99.3 Morison Mechanical Filter Less 00.7 per cent. Natural Filters at Lawrence, Mass. Average of the Average Percentages of Removal, given in the Tenth column of the first part of table No. 22, inclosed in parentheses, 99.5 Morison Mechanical Filter Less 00.9 per cent. I do not consider that the efficiency of a filter should be entirely based upon the average results obtained, although this is generally the standard upon which the efficiency is based, but that the worst results obtained should be duly considered. In order to present my ideas upon this subject more clearly I will assume a rather improbable case. For example, if one hundred individual results were used in working up an average, 90 of these results might each show an efficiency of 100 per cent., and 10 of them might each show an efficiency of only 80 per cent., or in other words 10 per cent, of the Total Results would be 18 per cent, below the Average Result, which in my opinion would be sufficient grounds to condemn a filter. Yet the average of the whole number would be 98.0 per cent., which is a very good result. The tables from No. 11 to No. 18 inclusive and table No. 22 were prepared in order to make comparisons of this kind. It is shown in table No. 9, that the average efficiency of the Experimental Morison Mechanical Filter is 98.7 per cent, (computed from all of the results that were obtained from samples that were collected One Hour or More after water commenced to flow from the filter), and by inspecting table No. 12, it can be seen that 16.7 per cent, of the Total ...


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Product Details
  • ISBN-13: 9781130391411
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 34
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1130391418
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 82 gr

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Report of the Results Obtained with Experimental Filters at the Pettaconset Pumping Station of the Providence Water Works
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