216 CLAYS AND CLAY INDUSTRY. 



Pot clay. — A clay used for the manufacture of glass pots, and 

 consequently representing a very dense-burning fire clay. In 

 refractoriness it ranges from a highly refractory to a refractory 

 clay. 



Paper clay. — This term is generally applied to fine-grained 

 white clays that can be used in paper manufacture. 



