he season, instead of dealing with different samples, as isnecessitated in the tube method of sampling and drying. The advan-tage of always working with the same portion of soil is emphasized bythe fact that a difference in water content of 2 or 3 per cent in dupli-cate samples is not an uncommon… … Fl(J. 1.—Soil hygrometer closed, ready for use, showing binding posts, .sc.ik-, and central plunger operating battery switch. ter has been applied, is an adaptation of the well known Wheatstonebridge method of measuring electrical resistances. The instrument,which is illustrated in figs. 1 and 2,…
Soils Analysis · Electric apparatus and appliances
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