72 



CONSTRUCTION OF RETORTS. 



Heaton's Main. 

 Gas of specific gravity '390 

 Coke of good quality 

 Ammoniacal liquor 

 Thick tar - 



Coal used as fuel 

 Lime for purifying 



Russell's Waifs-end. 

 Gas of specific gravity '400 

 Coke 



Ammoniacal liquor 

 Thick tar 

 Coke used as fuel 

 Lime for purifying 



8,690 cubic feet. 

 31 bushels. 

 12^ gallons. 

 12| ditto. 

 4 cwt. 18 Ibs. 

 l bushel. 



8,600 cubic feet. 



13 cwt. 3 qrs. 14 Ibs. 

 12^ gallons, 

 llf ditto. 



6 



84 



cwt. 

 Ibs. 



In country towns, where the quantity of gas made during the winter seasons 

 does not exceed 10,000 cubic feet in twenty-four hours, the retorts must be 

 set singly, as represented in Fig. 16., the flue passing beneath and over the 

 retort, which rests upon a half-brick arch, cut flat at the top to receive it ; 

 the end is guarded by a thick fire-tile. 



Fig. 16. 



lop flue 



furnace 



\ 



When the quantity of gas made in twenty four hours does not exceed 

 30,000 cubic feet, or when the quantity made is decreased 1200 cubic feet at 



