44 PURE CULTURES OF 



it is provided with two smaller ones which are made use of 

 during the process of steaming described below, partly for 

 running off the condensed water and partly for introducing 

 the steam. 



The cock shown at / is for withdrawing the beer and the 

 yeast. The construction of this cock is shown in Fig. 9, and 

 the direction in which the liquid passes through it is indi- 

 cated by the arrows. The valve is screwed down in opening 

 the cock and is screwed up when this is closed. In the 

 figure it is closed. Its construction prevents infection from 

 occurring whilst the liquid is being drawn off, as the liquid 

 cleanses the cock on passing through it. The pipe carrying 

 the cock is carried through the side of 

 the cylinder and is bent towards the 

 bottom, its end being 3 5 cm. above the 

 latter (see Fig. 10, C, /). It is, in 

 short, so arranged that no air from 

 without can enter the cylinder whilst 

 the contents are being drawn off. 



When the cylinder is fitted up in 

 the fermenting cellar, it may be covered 

 with laths as shown in Fig. 8, C. The 



cylinder with water-cap will be referred 

 FIG. 9. J 



to later on. 



The wort cylinder D, as is shown in Fig. 8, must be raised 

 somewhat above the level of the fermenting cylinder. (The 

 wort can, of course, also be forced into the fermenting cylinder 

 by means of compressed air, but in this case the wort cylinder 

 must be provided with a safety valve.) Its height is also 

 greater than that of the latter, but its diameter is the same. 

 At the top is a filter m exactly as at g t and connected with 

 it is a pipe (indicated by the dotted lines) passing inside the 

 cylinder. The lower closed end of this pipe has some small 

 perforations through which the air finds an exit after passing 

 through the filter. The tube n corresponds with the tube c 



