. Annual report 1921. Machine for Testing Fineness of Cement. Apparatus for Measuring Thermal Conductivity of Insulation of a Section of ArmatureCoil. Heat is supplied at one end of the coil and as heat is carried away throughthe insulation as well as lengthwise of the conductor the temperatureat the inner and outer surfaces of the insulation give an accuratemeans of determining the relative values between the insula-tion and copper as to thermal conductivity. Thesetemperatures are measured by properlyplaced resistance coils 278 FOURTEENTH ANNUAL REPORT OF THE No. 49 Concrete Testing and Resea
. Annual report 1921. Machine for Testing Fineness of Cement. Apparatus for Measuring Thermal Conductivity of Insulation of a Section of ArmatureCoil. Heat is supplied at one end of the coil and as heat is carried away throughthe insulation as well as lengthwise of the conductor the temperatureat the inner and outer surfaces of the insulation give an accuratemeans of determining the relative values between the insula-tion and copper as to thermal conductivity. Thesetemperatures are measured by properlyplaced resistance coils 278 FOURTEENTH ANNUAL REPORT OF THE No. 49 Concrete Testing and Research Several major investigations have been in progress during the year. Thestudies on the different methods of proportioning concrete mixtures carriedout in co-operation with the American Society for Testing Materials has beencompleted, and the use of certain admixtures for accelerating the early hard-ening of concrete has been studied. It has been found possible, by the addi-tion of small percentages of calcium chloride, to increase the early strengthsof c
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