84 



S. FILTERS. 



The filters are sheet iron cylinders of 10 feet in 

 height by 2-\ in diameter, with a bottom, but open at 

 the top. In the rear they are furnish. >d on a level 

 with the botlom, \v! f h a man hole to empty th:,'in, 

 'and in front, by a tube communicating with a "pipe 

 with two taps, one on a level with the bottom for 

 draining, and the other at the height of the charge 

 in the filter for the running off of the filtered juic s 

 and syrups. This level of running oifis necessary so 

 that all the charcoal can be covered with the liquid 

 and that the juice should prevent all contact between 

 the exterior air and the rhap'nal. contact which 

 might cause serious accidents. On the top there are 

 several pipe's which conduct the juice, syrup and hot 

 water. 



To charge the filter, a false bottom of pi " 

 sheet iron is placed on a Ird.L 1 ' - about two inches 

 from the bottom, and on this false bottom then- is 

 placed a cloth of light texture commonly called 

 bolting-cloth ; then the charcoal is brought and regu- 

 larly piled. At the upper part above the charcoal 

 and at one foot from the top of the lilter another 

 bottom of pierced sheet iron is placed, and covered 

 with another bolting-cloth. 



I must add that every time a filter is emptied it 

 should be carefully cleaned before placing new 

 charcoal in it. The walls are scrubbed to remove 

 everything that may have stuck to them and the 

 bottom is washed with hot water ; then the walls 



