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As a rapid method for routine determination of densities and porosities of rock samples, Gealy's modification of Russell's method is one of the best. An alternative procedure has been developed which eliminates various errors involved in direct, grain, and bulk volume measurements and subsequent porosity calculations. This increases considerably the accuracy of the method. It was found that mercury penetrates the pores of many samples. A protective coating of celluloid obviates this difficulty, and prevents loss of grains. The celluloid coating can be made so thin that errors due to the weight of the coating are negligible. The magnitude of errors due to this coating as well as those due to the method itself has been calculated and is given with data for typical samples.
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