A semi-empirical expression for sieve loads is W (gms) = 4(Delta O) Bx (super 1.15) , where x is the sieve aperture in mm and (Delta O) is the phi interval between sieves. B, the "acceptable" load on an x = 1.00 mm sieve, whether it is used or not, is given by C s GKacP; G is the weight density (g/cm 3 ); K is a shape factor; a and c are representative long and short particle intercepts measured in ram; P is the number of finer near-mesh particles, and C s is a parameter that varies with the internal diameter of the sieve. Equations for sieve loads can also be an aid in estimating sample size.

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