FUEIFYING THE RESIDUUM OF GAS-WORKS. 



849 



of two-iuch plauk, covered with two inches of cement. Fis the over- 

 flow-line. C is the overflow-pipe, with flange at bottom bolted to U, 

 and covered with cement to make it water-tight. H is the iron rod 

 with wheel at the top to turn valve I. I is the valve and box, laid in 

 cement, over discharge-pipe D. K is tbe lower section of the well, 

 which receives the ammoniacal liquor before it is discharged out of 

 pipe D. L is the pipe through which the tar and oil are pumped from 

 the bottom of section B. 31 is the chamber or box perforated with 

 small holes at the bottom of section B to collect the tar and oil from the 

 breeze so that it may reach the pump pipe L. 



For the sake of greater clearness, we give an enlarged view of the 

 a:nmonia well. 



54 



