TREATMENT OF FRESHLY-PREPARED VINEGAR. 151 



Fig. 41. 



pulp with fine bar sand the latter retains the greater portion of 

 the solid bodies suspended in the vinegar, and it will be a consid- 

 erable time before the pores of the paper pulp become choked up 

 to such an extent as to require its renewal. 



An arrangement suitable for filtering larger quantities of fluid 

 under an increased pressure is shown in Fig. 41. 



It consists of a strong linen bag, S, about 16 inches in diameter, 

 and a jute or hemp hose, JR, open at both ends and about 6 inches 

 in diameter. The bag is tied by means of pack-thread to a 

 cylindrical piece of wood which is secured to a suitable support. 

 The bag is then connected by 

 means of the rubber hose K 

 with the reservoir B y which con- 

 tains the vinegar to be filtered, 

 and is placed about 10 to 13 

 feet above the support carrying 

 the bag. The bag is folded so 

 that it can be inserted in the 

 hose R, the latter being also se- 

 cured to the cylindrical piece of 

 wood. 



By slowly opening the stop- 

 cock on the reservoir the bag is 

 filled with vinegar, but being en- 

 veloped by the hose R cannot en- 

 tirely expand but only as far as 

 permitted by the diameter of ft, 

 so that though its entire surface 

 acts as a filter a large number 

 of folds are formed, .and it is 

 thus protected from bursting 

 even under the pressure of a 

 column of fluid of considerable 

 height. The fluid filtering 

 through the bag runs down on 

 the hose and collects in a vessel 

 placed under it. 



At first this filter generally does not act entirely satisfactorily, 



Bag Filter for Filtering Vinegar under 

 Pressure. 



