Water Supply. a Student's Handbook On the Conditions Governing the Selection of Sources And the Distribution of Water
Water Supply. a Student's Handbook On the Conditions Governing the Selection of Sources And the Distribution of Water
Middleton, Reginald Empson, 1844-1925
The book Water Supply. a Student's Handbook On the Conditions Governing the Selection of Sources And the Distribution of Water was written by author Middleton, Reginald Empson, 1844-1925 Here you can read free online of Water Supply. a Student's Handbook On the Conditions Governing the Selection of Sources And the Distribution of Water book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Water Supply. a Student's Handbook On the Conditions Governing the Selection of Sources And the Distribution of Water a good or bad book?
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1880. 1890. 1900. Population. 20-0 23-6 29-0 34-2 41 49-6 57-7 68-8 Logarithm of Population 1-3010 1-3711 1-4624 I 1-5340 1-6128 1-6955 17612 1-8376 The top and bottom lines of this table have been plotted at a, 6, c, etc, (fig. 3), and it will be observed that the plotted points fall nearly in a straight line. 1 1 1 1 % § 1 \ \ 1 " ^* ^ c 7' ^^ • /.^ » • ' ^ y ^7 i'H ^ ^ £/ z S y^ M ^ « 1-7 / ,J7 -1 a ^_, _ i« ^ J ^ ^y V f'S > y / 7 5 / \ ^ /."4 40 y c^ o, r /^ i.3 ^ 2o JO 4a sa 60" Fxa. 3. .^... By stretching a fine thread on the diagram, the straight line A B, which approximated most closely to a mean position between them, was determined and drawn. Digitized by Google 40 WATER SUPPLY. This line having been determined, the probable population for any future year can be ascertained by scaling the vertical line corresponding to the year in question to its intersection with the line A B ; thus the log of population for 1910 is 1*9200, correspond- ing to a population of 83,177 persons, and so on.
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