AUTOMATIC VINEGAR APPARATUS. 



95 



and 3 and opening 1, the alcoholic liquid is immediately conveyed 

 from the collecting vessel to the reservoir. By closing spigot 1 

 and opening 2 and 3, which are connected by short pieces of 

 rubber hose with the ends of the coil S, the alcoholic liquid 

 forced upward from the collecting vessels by the pump must pass 

 through the heating coil, and after being heated it returns to the 



Fig. 29. 



Apparatus for heating the Alcoholic Liquid. 



rising pipe which conveys it to the reservoirs. The arrows in the 

 illustration indicate the course the alcoholic liquid has to traverse 

 when spigots 2 and 3 are open and 1 closed. 



The diameter and length of the tin coil depend on the quantity 

 of fluid which is to pass through it, though one with a clear 

 diameter of 12 to 14 inches and a length of 23 to 26 feet will, 

 as a rule, suffice ; besides by slower or quicker pumping the fluid 

 can be forced with less or greater velocity through the coil and 

 correspondingly more or less heated. The walls of the coil 

 should be as thin as possible so as to yield heat rapidly. 



