INDEX. 707 



Portland cement, effect of plaster, 534-545 

 salt, 598-601 

 sea-water, 602-603 

 , fineness, 584-585, 606 

 , methods of analysis, 604 

 , methods of manufacture, 398-565 

 , modulus of elasticity, 591-592 

 , origin of names, 294-295 

 , packing weights, 548-553 

 , physical properties, 582-613 

 , production of, 561-585 

 , raw materials for, 300-381 

 , specific gravity, 385-386, 605-606 

 , specifications for, 614-631 

 , tensile strength, 586-588, 612 

 , use of gypsum or plaster, 535-545 

 Potash, see Alkalies. 

 Prospecting, see Examination. 

 Prost, S., on effects of granulating slag, 648 



slags suitable for slag cement, 641-642 

 Pulverized coal as kiln-fuel, 486-489, 512-522 

 Pulverizer, Clark, 243 



, Cyclone, 238 

 , Raymond, 466 



Pulverizing machinery, see Crushing machinery. 

 Purington, C. W., on use of steam-shovels, 373 

 Puzzolan cements, definition, 9, 632 



' , raw materials for, 632-640 



, see also Slag cement. 

 Pyrite in limestone, 91, 310, 388 

 see also Sulphur, Sulphides. 



Quarrying clays, 370-375 

 gypsum, 28, 30 



limestone, 109, 219-221, 367-375, 378-379 

 natural-cement rock, 219-221 

 Portland-cement material, 367-375, 378-379 

 shales, 370-375 



Ransome kiln, see Kiln, rotary. 



Ratio between compressive and tensile strength: natural cement, 275-276 



Portland cement, 589-591 

 slag cement, 670-671 

 silica and alumina, see Alumina, Index. 



Raymond pulverizer, 466 



Retarders for plasters, 50, 64-66 



Portland cement, 534-547 



Richards, J. W., on tests of rotary kiln, 506, 507, 509 



Richards, R. H., on costs of crushing, 433 



