60 VINEGAR, CIDER, AND FRUIT-WINES. 



equally through the body of the generator and also of stopping it 

 from passing too rapidly through it (see Fig. 9). It is important to 

 pack the disk so tightly against the walls of the generator that none 

 of the liquid can percolate, which is best effected by a packing of 

 tow and coating this with a mixture of equal parts of wax and 

 colophony. The dripping of the alcoholic fluid through the disk 

 taking place uniformly only when the latter lies perfectly hori- 

 zontal, great care must be exercised in placing the generator. To 

 prevent warping several strong cross pieces are inserted in the 

 lower side of the disk. 



Fig. 9. 



Cross Section of the Disk. 



As previously mentioned the current of air must pass through 

 all portions of the filling, and for this purpose seven short glass 

 tubes, r (Fig. 8), about J inch in diameter, are inserted in the disk. 

 These tubes are so arranged that one is in the centre of the disk 

 and the others in a circle equidistant from the centre and the 

 periphery. Upon the disk is placed the well-fitting cover, pro- 

 vided with an aperture for the passage of the air. This aperture, 

 about 3 inches square, is provided with a well-fitting slide, so 

 that it can be made larger or smaller at will. As previously 

 stated, it is more suitable to provide the cover with a large 

 number of draught holes arranged in concentric circles and to fit 

 each hole with a wooden stopper. By withdrawing or inserting 

 the stoppers the draught of air can then be properly regulated. 



To effect the influx of air from below in such a manner that it 

 not only takes place through the draught holes in the circumfer- 

 ence, but also insures its conveyance to the centre of the appa- 

 ratus, it is recommended to insert in the centre of the lower part 

 in which the fluid collects a tube, R, Fig. 10, which is open at 

 both ends and protected above by the hood H against the drop- 

 ping in of alcoholic liquid. 



