THE ECONOMIC MINERAL PRODUCTS OF OHIO 



Introduction 138 



Iron 139 



Early furnaces 



Early methods 



Products 



Decline of the industry 



Building stones 143 



Important properties 

 Limestone 

 Sandstone 

 Flagging stone 

 Other quarry products 



Salt 148 



Early development 

 Geological relations 

 Origin of salt 



Glass Sand 153 



Sources 



Preparation for market 



Other sands 154 



Moulding, building, engine, furnace 



Lime 155 



Uses; sand-lime brick 



Cement s 156 



Natural, pozzuolane, Portland 



Abrasives 157 



Natural, artificial 



Natural gas 158 



Early history 

 Pre-commercial use 

 Commercial exploitation 

 Conservation 



Oil 162 



Early history 



Washington, Noble, Trumbull, Morgan, Wood counties 



In other counties 



The handicap of early wells 



137 



