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Casagrande Device
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The apparatus consists of a standard dish, which is filled with a soil sample of known water content. A standard-size groove is made in the sample. The device is agitated by turning a handle connected to a cam like system which lifts the dish a distance before dropping it onto a hard surface. The experiment is stopped when the sides of the groove fail. The boundary for defining the liquid limit is 25 rotations of the handle at 2 r/s.