Sec. 158.3. Sieves

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Fineness shall be measured in reference to a 20-mesh and 100-mesh sieve only. The sieves used shall be full height, eight-inch diameter, of the United States standard sieve series; so-called Tyler sieves, as adopted by the American Society for Testing and Materials (see A.S.T.M. Designation: E-11-61), the National Bureau of Standards and the Association of Official Agricultural Chemists.

                    
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