DEPARTMENT OF COMMERCE Technologic Papers of THE Bureau of Standards S. W. STRATTON, DIRECTOR No. 169 MEASUREMENT OF PLASTICITY OF MORTARS AND PLASTERS BY WARREN E. EMLEY, Chemist Bureau of Standards JUNE 28, 1920 PRICE, 10 CENTS Sold only by the Superintendent of Documents, Government Printing Office Washington, D. C. WASHINGTON GOVERNMENT PRINTING OFFICE 1920