INDEX. 705 



McKenna, C., on properties of Lafarge cement, 185-186 

 Mill, Cummings, 241-243 



, emery, 35, 125, 239-241 



, Griffin, 243, 404, 425, 440-443, 516 



, Huntingdon, 404, 425, 438-440 



, Kent, 443-447 



, Sturtevant, 35, 125, 239-241 



, Williams, 244-245, 466-468, 516 



see also Crushing machinery. 

 Millstones, 125, 239-243, 437 

 Mills, G. S., on tests of lime, 122 

 Mining gypsum, 29 



limestone, 219-221, 375, 379 

 natural-cement rock, 219-221 

 see also Costs of excavation. 

 Mixer, Broughton, 50 



Natural cements, analyses, 2G3-262 



, compressive strength, 274 



, compressive-tensile ratio, 275-276 



, cost of manufacture, 248-251 



, definition of, 195 



, effect of gypsum or plaster, 264 



, effect of heat on strength, 275 



, effect of salt, 267 



, fineness, 236-237, 246-247 



, history, 285-289 



, methods of manufacture, 223-247 



, modulus of elasticity, 277 



, packing weights, 248 



, physical properties, 262-277 



, rapidity of set, 263 



, raw materials for, 200-222 



, statistics, 289-292 



, tensile strength, 267, 283 

 Natural gas in rotary kilns, 489-490, 522-524 

 "Natural Portland" cements, 214-217 

 Newberry, S. B., on change in composition during burning, 396-397 



constitution of Portland cement, 567, 569, 570, 574 

 formula for cement mixtures, 391-393 

 heat used in kiln, 505, 509 

 Kent mill, 445 



Nihoul and Dufossez, on effects of plaster, 537, 539, 540 

 Nippers, used in grinding gypsum, 34-35 



O'Connell lime-kiln, 106-107 

 Oil used in rotary kilns, 522 

 Organic matter, as retarder for plasters, 65 

 , in marls, 341, 343 



