Moisture content and physical condition of soils . Fig. 28.—Apparatus for packing soils. containing per cent water is shown. In addition to the packingcaused by the soil falling from the screening machine, the soil wasfurther compressed under pressure of 10, 30, and 50 grams per squarecentimeter. These pressures correspond to weights of 1, 3. and 5 kilos,the area of the compressing plate being about 100 square curve indicates that the increased packing pressure applied in thismanner gives a fairly uniform increase in the force required for pene-tration. APPAKATUS AND METHOD
Moisture content and physical condition of soils . Fig. 28.—Apparatus for packing soils. containing per cent water is shown. In addition to the packingcaused by the soil falling from the screening machine, the soil wasfurther compressed under pressure of 10, 30, and 50 grams per squarecentimeter. These pressures correspond to weights of 1, 3. and 5 kilos,the area of the compressing plate being about 100 square curve indicates that the increased packing pressure applied in thismanner gives a fairly uniform increase in the force required for pene-tration. APPAKATUS AND METHODS. 63 PENETRATION APPARATUS. 240 The force required for penetration was measured on the apparatusshown in figure 30. The penetrating tool A is made from a steelrod 1 centimeter in diameter. This is turned into the form of acone centimeters long and 1 centimeter in diameter in the thickestpart. The large end of this cone terminates in a tongue which is sofastened to the scale beam AB that it is free to swing in the verticalplane of the beam
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