3 



QUICK PROCESS OF FABRICATION OF VINEGAR. 63 



factories can be constructed only of a material indifferent to the 

 action of acetic acid, such as wood, glass, hard rubber, etc. Their 

 construction will be understood from Figs. 14 and 15. 



Fig. 14. 



Sparger (view from above). 



Into a hollow cylinder of wood are screwed four thin wooden 

 tubes, closed at both ends and perforated lengthwise with nume- 

 rous small holes ; the tubes are so arranged that all the holes are 



Fig. 15. 



Sparger (cross-section). 



directed towards one side. The basin in the centre is closed on 

 top by a glass tube about 20 inches long and of sufficient width 

 to allow of the passage of as much fluid as can at one time run 

 off through all the lateral tubes. 



