A laboratory sample splitter was designed in the form of a 600 cone over those surface the entire sample passes. The split is captured by falling through pie-shaped slots on the surface of the cone. The splitter sampled an average of 13.5% of a crushed quartz monzonite, of which 80% passes a 140-mesh sieve. The amount of sample captured is dependent on the particle size of the material sampled. A line of regression of the percent captured on size, and confidence limits for the estimate of the means of the amount split, are shown. Some qualities desirable in a splitter are enumerated, and the conformity of several splitters to these criteria is discussed.

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