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. 1897 Excerpt: ...used very largely in those cases in which it was desirable to make tests on the spot, and before the samples could undergo change. The following woodcut shows the apparatus employed, with the exception that where coal gas is available the hydrogen generator may be displaced. The process is described at length in the ...
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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. 1897 Excerpt: ...used very largely in those cases in which it was desirable to make tests on the spot, and before the samples could undergo change. The following woodcut shows the apparatus employed, with the exception that where coal gas is available the hydrogen generator may be displaced. The process is described at length in the Appendix. Upwards of 150 estimations were made, and from the figures thus obtained a curve was constructed, showing the rate of absorption for each percentage degree of aeration. These results are shown in the diagram. From this it will be seen that a water absolutely free from oxygen dissolved therein will absorb in one hour 10 per cent. of the total possible quantity which it can take at ordinary temperature and pressure, viz., about l-8 cubic inches per gallon. In two hours it will have taken up 20 per cent. In three hours the quantity of oxygen dissolved will have increased to 26 per cent.; in four hours to 32 per cent.; in five hours to 36 per cent.; in six hours to 40 per cent.; in seven hours to 43 per cent., and so on, until ten hours are required for it to absorb only one-half its total quantity, viz., 50 per cent., the rate decreasing as the degree of saturation increases, until, as it approaches saturation, it takes only a few tenths of a per cent. per hour. As showing the practical bearing of these results upon the water of the river Thames, we may consider their effect on the tidal portion of the river from Teddington to the Nore. The following table of the average quantity of dissolved oxygen at fifteen different points at and between these places, shows the average percentage quantity of oxygen dissolved in the water from July, 1893, to March, 1894: --Average percentage Quantity of Oxygen (saturation = 100) Dissolved in the Water o..
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Add this copy of The Purification of Sewage and Water to cart. $68.52, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Santa Clarita, CA, UNITED STATES, published 2010 by Nabu Press.
