INDEX. 701 



Gypsum, composition of, 14 



, distribution of, 16-28 

 earth, analyses, 54 

 , character, 15 

 , methods of excavating, 30 

 , excavation of, 28-30 

 , origin of, 15 

 , physical properties, 15 

 , specific gravity, 15 

 , used in natural cement, 264 



plaster manufacture, 14-30 

 Portland cement, 534-545 

 , varieties, 15 



Hair, used in wall-plaster, 51 



Hair-picker, 51 



Hale, D. J., on prospecting marl deposits, 344-346 



Hardening gypsum, methods for, 67 



Hardening-cylinders for lime-sand brick, 138-140 



slag brick, 680-685 



Hard-finish "cements," see Hard-finish plaster. 

 Hard-finish plasters, analyses, 77 

 , definition, 32 

 , manufacture, 76-78 

 , properties, 78 



Harris system of pumping marl, 376-377 

 Hauenschild kiln, 475-477 

 Heat consumption, see Fuel consumption. 

 Heat losses in rotary kiln, 502-511 

 Heat requirements in burning lime, 98-99 



Portland cement, 497-501 

 Heat units, definition of, 12 



Helbig, A. B., on heat used in rotary kiln, 505, 509 

 Hoffmann kiln for burning lime, 106-108 



Portland cement, 472-474 

 Huennekes system, lime-sand brick, 143 

 Huntingdon mills, 438-440 



Hurry and Seaman "blast-furnace" methods, 415-416 

 Hydrate cementing materials, definition, 4 

 Hydrated lime, cost of installation for, 128 

 , methods of making, 124-129 

 , packing weights, 128 

 , with Portland cement, 129 

 Hydraulic index, defects of, 169 



, explanation of, 169 

 of various cementing materials, 169 

 , use in classification, 169 

 Hydraulic limes, analyses, 179, 188 



, classification of, 173 



