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On the capillary forces in an ideal soil; correction of formulae given by W. B. Haines

Published online by Cambridge University Press:  27 March 2009

R. A. Fisher
R. A. Fisher
Affiliation:
(Rothamsted Experimental Station, Harpenden, Herts.)
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Extract

1. The omission of the tension in the air-water interface has introduced an erroneous factor into Haines’ formulae; certain additional factors have also crept into his expressions for average stress.

2. With these corrections, the stress due to moisture varies comparatively little with changing water content, though falling slightly throughout the range. The energy needed to cause rupture rises continuously in a manner not unlike Haines’ measurements, and should more probably be associated with them than should the tensile stress.

3. The geometrical approximation used by Haines gives a close geometrical representation of the figure, but a mechanical approximation which is less satisfactory. Since neither the formulae connected with the true curve, nor the tables needed to use them, are readily, accessible, sufficiently exact numerical data have been here put on record.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 16 , Issue 3 , July 1926 , pp. 492 - 505
Copyright
Copyright © Cambridge University Press 1926

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References

REFERENCES

(1)Haines, W. B. (1925). Studies in the Physical Properties of Soils. II. A note on the cohesion developed by capillary forces in an ideal soil. Journ. Agr. Sci. 15, 529–535.CrossRefGoogle Scholar
(2)Legendre, A. M. (1826). Traité des fonctions elliptiques. Tome second. Hazard. Courcier, Paris.Google Scholar