CLINKER COOLING, GRINDING, AND STORAGE. 



551 



taken up in a proper spirit by both sides, will prevent many difficulties- 

 and misunderstandings. 



If the duties of such an inspector are to be properly carried out, 

 however, he should possess a somewhat intimate knowledge of the 

 processes of cement manufacture. The position is, moreover, one of 

 extreme delicacy, and it offers abundant opportunity for bribery on the 

 one side and blackmail on the other. For these reasons it is obvious 

 that a mill-inspector must be a man of special training and qualifica- 

 tions and unimpeachable integrity. As a matter of fact, such men are 

 rarely obtainable for this position, and the inspector is usually a young 

 engineer, with but little knowledge of the points which it is necessary 

 to guard against. 



Packing. According to the recently issued specifications of the 

 American Society for Testing Materials, quoted later, Portland cement 

 should be packed in bags of 94 Ibs. net weight, four of which make a 

 barrel of 376 Ibs. net. Several other important specifications require a 

 barrel of 375 Ibs. net. In ordinary calculations it is often assumed for 



C.L. of Conveyor. 



FIG. 141. Foundation plan of cement stock-house, Hudson Portland Cement Co. 



FIG. 142. Plan of bins in cement stock-house, Hudson Portland Cement Co. 



convenience that a barrel of Portland cement weighs 400 Ibs. gross or 

 380 Ibs. net. The following table (209), published some years ago by 

 Mr. Sanford Thompson,* gives the results of a series of actual tests on 

 the weight, size, etc., of cement barrels. 



* Thompson, Sanford E. Weights of Portland cement and capacity of cement 

 barrels. Engineering News, Oct. 4, 1900. For a more detailed discussion of the 

 subject, reference should be made to Taylor and Thompson's "Concrete, Plain, 

 and Reinforced", 1905, pp. 216 et seq. 



