Abstract
A method is described for determining the rate of sedimentation of clays by measuring the suspended weights of a glass plummet suspended in a clay slip at different intervals of time. The specific gravity of the slip remaining in suspension may be calculated as follows: S = Pd-Ps/Pd-Pw where S is specific gravity of slip, Pd is dry weight of a plummet in grams, Pw, is suspended weights of plummet in distilled water and Ps, is suspended weight of plummet in clay slip. The average weight of clay per cc. is calculated as follows: Cw= D(S-d)/D-d, where Cw, is average weight of clay per cc., D is the specific gravity of clip and D is the specific gravity of water. It is impractical to separate by elutriation, clay particles smaller than 0.003 mm. which constitute 50–100% of many clays. It is possible to classify particles as small as 0.0001 mm. by the plummet sedimentation method and the results are more uniform than those obtained by elutriation.
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