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A sorting index which differs from any introduced to this date is proposed. This index has a maximum of 100 per cent when all particles lie within a single grade size and has a minimum of 0 per cent when all class intervals contain equal masses of particles. The equation for the index is Sᵢ = 100 + k∑ᵢ₌₁ⁿfᵢ log₁₀fᵢ. Tables for rapid calculation of the index directly from size analysis data are given.
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Sharp et al. (1963) studied this question.
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