xi v CONTENTS. 



PAGE 



Schulze's ventilating apparatus, with illustrations; Description of 



Sehulze's generator .75 



Objections to Schul/e's apparatus .... 76 



Generators with constant ventilation and condensation ; The object of 



special ventilating contrivances ; Ventilating apparatus according to 



Bersch, described and illustrated ..... .77 



Condensing apparatus, described and illustrated ... .78 



Proposed method of regaining the vapors ; Objection to this method . 80 



CHAPTER IX. 



AUTOMATIC VINEGAR APPARATUS. 



The principal work which has to be performed in a vinegar factory . 80 

 Disadvantages of pouring at stated intervals the alcoholic fluid into the 

 generators ........... 81 



Advantages to be derived from the use of simple automatic contrivances ; 

 Division of continuously working apparatus into two principal sys- 

 tems ; Continuously working apparatus the terrace system . . 82 

 A factory arranged according to the terrace system described and illus- 

 trated 83 



Objections to the terrace system 84 



Advantages of the group system ; Mode of distributing the alcoholic 



liquid into each generator in the terrace system . ... .85 

 Periodically working apparatus the three-group system ; Modification 



of the tilting trough, described and illustrated 87 



The siphon barrel, described and illustrated 88 



The bell-siphon, described and illustrated 89 



Example for calculating the space required beneath the lath-bottom of 

 the generator for the reception of the fluid ; Arrangement of a vinegar 

 factory working according to the automatic principle ... 90 

 Manner of arranging the generators in groups ; Height of the actual 

 work-room ; Location of the reservoir and of the collecting vessels ; 

 Description of a periodically working establishment with 24 generators 91 

 Manner of working in such an establishment ..... 93 

 Material for metallic vessels used in the factory ; Location of the pump ; 

 Advantage of heating the alcoholic liquid before its introduction into 

 the generators ; Apparatus for heating the alcoholic liquid described 

 and illustrated ....... 94 



CHAPTER X. 



OPERATIONS IN A VINEGAR FACTORY. 



Acidulation of the generators ; Object of acidulation ; Manner of {undu- 

 lation ; Quantities of vinegar required for complete acidulation 96 



