LIST OF TABLES. 



PAGE 



1. Production of structural materials, 1902-1903 1 



2. Value of cementing materials produced in the United States, 1900-1903. . . 2 



3. Symbols and atomic weights of elements H 



4. Names and symbols of principal compounds 12 



5. Sizes, capacity, etc., of Stedman disintegrators , '. 36 



6. Temperatures in cement-plaster manufacture 44 



7. Sizes, capacity, etc., of Broughton mixers 50 



8. Analyses of rock gypsum used for plaster 53 



9. Analyses of gypsite (gypsum earth) used for plaster 54 



10. Analyses of plaster of Paris 57 



11. Analyses of cement-plasters 57 



12. Fineness of calcined plasters 58 



13. Fineness of plasters tested 59 



14. Tensile strength of plasters: effect of sand 59 



15. Tensile strength of plasters 61 



16. Effect of sand on compressive strength of plasters 63 



17. Adhesive strength of plasters 63 



18. Effect of retarders on strength of plasters 65 



19. Effect of various retarders on rate of set of plasters 66 



20. Effect of accelerators on rate of set of plasters 67 



21. Tensile strength of Keene's cement 78 



22. Tensile strength of American Keene's cement 78 



23. Total imports and production of gypsum in U. S., 1900-1903 79 



24. Uses of gypsum, 1900-1903 79 



25. Gypsum production of the U. S., by uses, 1890-1903 80 



26. Gypsum production of the U. S., by States, 1902-1903 82 



27. Production and volume of gypsum in U. S., by States, 1890-1901 83 



28. Imports of gypsum and plaster, 1900-1903 85 



29. Imports of gypsum and plaster, by countries, 1900-1903 86 



30. World's production of gypsum, 1893-1903 87 



31. Analyses of various molluscan shells 95 



32. Analyses of oyster-shells and oyster-shell lime 95 



33. Heat and fuel required in burning lime 99 



34. Sizes, capacity, etc., of Keystone lime kilns 106 



