TABLE OF CONTENTS. 



IX 



Standards for packing, etc 128- 



Cost of equipment 128 



Tests of hydrated lime 128 



Mixture of hydrated lime and Portland cement 129 



References on hydrated lime % 129 



CHAPTER X. 



MANUFACTURE AND PROPERTIES OF LIME-SAND BRICKS. 



Definition 130 



Early history of the industry, 1838-1856 130 



Theory of lime-sand brick manufacture 132 



General processes of lime-sand brick manufacture 134 



Necessary properties of the sand 134 



Drying the sand 135 



Necessary properties of the lime 135 



Methods of slaking the lime 136 



Proportions of mixture 138 



Methods of molding 138 



Methods of hardening the bricks 138 



Costs of plant and manufacture 140 



Composition of lime-sand bricks 142 



Physical properties of lime-sand bricks 142 



Tests of lime-sand bricks 142 



Comparison with clay bricks 145 



Comparison with natural sandstone 146 



Statistics of the lime-sand brick industry , 146 



List of references on lime-sand bricks . 146 



PART III. MAGNESIA AND OXYCHLORIDE CEMENTS. 

 CHAPTER XL 



SOURCES AND PREPARATION OF MAGNESIA. 



Sources of magnesia 148 



Magnesite as a source of magnesia 148 



Composition and character of magnesite 148 



Occurrence and origin of magnesite 149 



Distribution of magnesite deposits 149 



Foreign localities 149 



American localities 150 



Production and imports of magnesite and magnesia 152 



Analyses of commercial magnesite 152 



Effects of heating magnesite 154 



Methods of burning magnesite 154 



Composition of the product 155- 



Use of magnesite for preparation of carbonic acid, etc 155 



