FABRICATION OF VINEGAR. 



141 



thirty-two. The entire apparatus is inclosed in a glass case pro- 

 vided below with several apertures, n, with regulators, and above 

 with a valve, m, by which the accurate regulation of the draught 

 of air in the apparatus is to be effected. The rubber hose g se- 

 cured to the reservoir E conducts at h the alcoholic liquid through 

 the lid covering the uppermost vat A. In this vat the liquid 

 rises to a certain height, runs through the apertures in the sides 

 of the tubes into the vat J5, from this in a similar manner into 

 A v B v and finally into the collecting vessel D. 



The process of the formation of vinegar is claimed to proceed 

 in the tubes connecting the vats with each other. Fig. 37 shows 



Fig. 37. 



Singer's Apparatus (Connection of two Vats with each other). 



the arrangement of these tubes on an enlarged scale. The wooden 

 tubes are closed above and provided each with four apertures for 

 the influx of alcoholic liquid. Inside of each tube are six an- 



