Abstract

Though a detailed mechanical analysis is done as a regular routine in the course of a soil study, a rapid separation into two fractions one of which is the coarse fraction including coarse and fine sand and the other is the fine fraction including silt and clay has been tourd to yield useful preliminary information and to be valuable in advisory work especially when large numbers of samples have to be dealt with rapidly. The fine fraction is determined by Robinson's pipette method and the residne left after the removal of clay and silt by the sediment- ation method (beaker method) is the coarse fraction. Both these fr..ctions may be estimated directly or one of them alone determined directly and the other obtained by subtraction from 100.

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