. The nature and properties of soils; a college text of edaphology. Soils. 172 NATURE AND PROPEETIES OF SOILS continues to be withdrawn at A, this adjustment goes on with considerable ease until the film channel (ee^e'O becomes so thin as to cause its surface now (bb'b'O to approach very closely to the surface of the soil particle and the inner capil- lary water. The sluggishness of the water movement becomes a factor at this point, impeding the capillary adjustment to- ward A. This point of sluggish capillary movement has been designated by Widtsoe^ as the point of lento-capillarity^ and. Pig
. The nature and properties of soils; a college text of edaphology. Soils. 172 NATURE AND PROPEETIES OF SOILS continues to be withdrawn at A, this adjustment goes on with considerable ease until the film channel (ee^e'O becomes so thin as to cause its surface now (bb'b'O to approach very closely to the surface of the soil particle and the inner capil- lary water. The sluggishness of the water movement becomes a factor at this point, impeding the capillary adjustment to- ward A. This point of sluggish capillary movement has been designated by Widtsoe^ as the point of lento-capillarity^ and. Pig. 32.—Conventional diagram for the explanation of the effect of tlie thickness of water film about the soil particles and their colloidal complexes on the ease of capillary adjustment. is expressed m percentage based on the dry weight of the soil. It lies near the transition zone between the inner and outer capillary water. The amount of capillary water delivered at any one point, therefore, will obviously be influenced by the thickness of the film and may consequently be taken as a measure of rate of adjustment. A short soil column should deliver more water than a longer one, due to the thicker films at the surface of the former. King,^ in studying the evaporation from the sur- faces of sand columns of diiferent lengths, their bases being in contact with free water, obtained some significant data. ^Widtsoe, J. A., and McLaughlin^ W, V^., The Mo^oement of Water in Imffated So%ls; Utah Agr. Exp. Sta., Bui. 115, pp. 223-231, 1912, *King, F. H., Prmciples and Conditions of the Movements of Ground Water; U. S. Oeol. Survey, 19th Ann. Rept., Part II, p. 92^ 1897- 1898. Also Briggs, L. J,, and Lapham, M. H.^ Capillary Studies; U. S, Dept. Agr. Bur. Soils, Bui. 19, pp. 24-25, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble th
Size: 2733px × 915px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlyontlth, bookcentury1900, bookdecade1920, bookyear1922
