TABLE OF CONTENTS. 



xxi 



Stationary tower coolers 528 



One-stage rotary cooler 529 



Atlas two-stage rotary cooler 529 



Clinker grinding 530 



Power and machinery 531 



Increase in fineness 531 



Actual equipment of various plants 532 



Use and effects of gypsum or plaster 534 



Form in which the calcium sulphate is used 535 



Effect of calcium sulphate on set of cement 538 



Effect of calcium sulphate on strength of cement 543 



Methods of using gypsum or plaster 545 



Analyses of gypsum and plaster actually used 545 



Effect of various other salts on set of cement 545 



List of references on use of calcium sulphate, chloride, etc 547 



Storage and packing 548 



Necessity for storage 548 



Designs of storage buildings and bins 548 



Testing at the mill 549 



Packing weights 551. 



CHAPTER XXXVII. 



COSTS AND STATISTICS. 



Costs of manufacture of Portland cement 554? 



Factors of cost 554 



Cost of land and quarries 555 



Cost of equipment and erection 555 



Total capital required 556 



Current administrative expenses 557 



Cost of excavating raw materials 557 



Total power required 557 



Cost of coal for kilns and power 558 



Cost of gypsum used 558 



Distribution and cost of labor 558 



Estimates of total cost per barrel 559 



Statistics of the American Portland cement industry 561 



Total production in the United States, 1870-1904 562 



Production by States, 1901, 1902, 1903 562 



Production in the Lehigh district, 1890-1903 564 



Imports of foreign Portland, 1899-1903 564 



CHAPTER XXXVIII. 



CONSTITUTION, SETTING, PROPERTIES, AND COMPOSITION. 



Limitations of chemical analyses 566 



Constitution and setting properties 56ft. 



