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  • 1
    Publication Date: 1934-08-01
    Print ISSN: 0016-0032
    Electronic ISSN: 1879-2693
    Topics: Mathematics , Technology
    Published by Elsevier
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  • 2
    Publication Date: 1932-01-01
    Description: In this paper the general theory of the coagulation of dilute clay suspensions is discussed. The more important of the points considered are summarised below.1. Two separate mechanisms causing collisions between suspended particles are considered, namely their Brownian motion and the mass motion of one group of particles relative to another group. Following Wiegner, these two types of collision are called perikinetic and orthokinetic collisions respectively. The rate of coagulation of a suspension is then shown to depend on the rate of collisions between particles and on the probability of adhesion between them when they collide. If this probability is unity, that is if every collision between two particles results in their adhesion, the suspension is undergoing rapid coagulation. There is excellent agreement between theory and experiment for this type of coagulation whenever the mathematical equations involved can be solved. But if the probability of adhesion is less than unity, the suspension is undergoing slow coagulation, and there is as yet no theory capable of giving the rate of coagulation of such a system.
    Print ISSN: 0021-8596
    Electronic ISSN: 1469-5146
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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  • 3
    Publication Date: 1933-04-01
    Description: SummaryThe conclusions that have been arrived at from the foregoing statistical examination of the available data on the physical properties of the Natal soils used by Coutts are:(1) The base exchange capacity of the soil, as measured by Schofield's potassium phosphate buffer method, appears to be of predominant importance for predicting several of the soil properties, as for example the sticky point and the moisture content at 50 per cent. relative humidity. On the other hand, the clay content seems to be of quite minor importance in predicting these soil properties.(2) The information from the data supplied by the Keen-Raczkowski box indicates that ω, the weight of water held per gram of soil in the box is very closely correlated with the base exchange capacity of the soil, while the swelling and pore-space parameters are more complex. The swelling υ seems to be dependent on the base exchange capacity of the soil and a term probably representing the structure of the soil, while the pore space p seems to be dependent on the clay content and a soil structure term. By choosing an appropriate definition of the pore space practically all the structure information given by the swelling parameters is contained in it.
    Print ISSN: 0021-8596
    Electronic ISSN: 1469-5146
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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  • 4
    Publication Date: 1934-10-01
    Description: The science of land amelioration, or “Kulturtechnik” as it is called in Germany, where it has been chiefly developed, is concerned with the scientific principles underlying the improvement of agricultural land by such means as artificial soil drainage, irrigation, river regulation and land reclamation. Since the War it has been attracting increasing attention throughout the Continent, and it now ranks as one of the most important branches of soil science. In England land amelioration has, for political and economic reasons, been very much neglected during recent years, and in consequence there has been little opportunity for scientific research on problems relating to it. The difficulty of studying these problems is greatly increased by the fact that some of the most important literature is either inaccessible or is only available with difficulty in Great Britain. It is hoped that the present résumé will to some extent fill the gap as far as one particular branch—that of artificial drainage in mineral soils—is concerned. Discussion of the drainage of peat soils has been omitted, since this presents rather different problems, and can only be adequately considered in relation to the reclamation of such soils as a whole. Mole drainage and the various combined mole-tile systems have also been left out of consideration to a great extent, since, in spite of their importance, very little scientific research has been done on them. Except where otherwise stated, the present account is confined to tile drainage.
    Print ISSN: 0021-8596
    Electronic ISSN: 1469-5146
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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  • 5
    Publication Date: 1934-04-01
    Description: Two methods of determining the weight and one method of determining the volume of water imbibed by a soil have been discussed. The results of these methods have been shown to be concordant by an independent method.The tentative conclusion reached is that the weight of water a soil imbibes can be readily determined by Fisher's method or from the Keen-Raczkowski box, but that the volume of imbibed water cannot yet be directly determined accurately.
    Print ISSN: 0021-8596
    Electronic ISSN: 1469-5146
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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