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A sieve method of analysis for determination of particle size of all coal, except anthracite, powdered coal as used in boiler plants, and crushed coal as charged into coke ovens is described. Round-hole screens varying in size from sup 3sub 8 in. 9.5 mm to 8 in. 203 mm and wire-cloth sieves No. 200 75 to No. 4 4.75 mm are ...