76 



VINEGAR, CIDER, AND FRUIT- WINES. 



the trickling in of vinegar (see Fig. 10). By a suitable inter- 

 mediate piece, this tube is connected with the draught-pipe (see 

 Fig. 21), in which the ascension of the air by heating is effected. 



Fig. 21. 



^^5^^^^^^^^^^^^^^^5^5s> 



1 '"1 i i I 1 



Schulze's Ventilating Apparatus. 



The draught-pipes are of cast iron, and are about J-inch thick 

 and about 4^ feet long, with a clear diameter of 2 inches. They 

 are placed, strongly inclined, over the flues of a heating appara- 

 tus and covered above by a double course of stone. The air in 

 the iron draught-pipes, being heated by the escaping gases of 

 combustion, ascends and effects the passage of a current of air 

 from above to below in the generators. For keeping up a con- 

 stant ventilation it is claimed to be sufficient to heat the furnace 

 only once a day. With this construction it is necessary to have 

 as many draught-pipes as there are generators; the same effect 

 might, however, also be attained by connecting the pipes leading 

 from several generators with a draught-pipe of a somewhat greater 

 diameter and length. 



It is not difficult to prove that a uniform ventilation of the 

 generators cannot be obtained by the use of this construction. 

 As long as the draught-pipes are strongly heated, a very rapid 

 current of air will pass through them and the generators con- 



