THE ROTARY KILN. 



495 



here listed are good average plants. Mill results A and B are from 

 one of the best of the Lehigh district plants, while J is perhaps the 

 best of all marl-plants. Excluding these three, it will be seen that the 

 production per kiln per day is considerably lower, and the fuel con- 

 sumption much higher, than is usually allowed for. 



TABLE 185. 

 ACTUAL OUTPUT AND FUEL CONSUMPTION AT VARIOUS PLANTS. 



Using the figures above given as a basis, Table 185 has been con- 

 structed to give some idea of what may fairly be expected from kilns 

 of various length working on different raw materials. 



TABLE 186. 

 AVERAGE OUTPUT AND FUEL CONSUMPTION. 



* Based on only one plant. 



