MUENCKE'S FILTER. 



in Fig. 32. Into the narrow part of the funnel an india- 

 rubber stopper is fitted, ^ 

 which has a perforation 

 in it sufficiently large to 

 receive the candle, which 

 it should grasp tightly. 



(c] Muencke's modi- 

 fication of the Cham- 

 berland principle is seen 

 in Fig. 33. It consists 

 of a thick -walled flask, 

 , the lower part conical, 

 the upper cylindrical, 



FIG. 33. Muencke's modification of 

 Chamberland's filter. 



with a strong flange on the 

 lip. There are two lateral 

 tubes, one horizontal to con- 

 nect with exhaust-pipe, and 

 one sloping, by which the contents may 

 be poured out. Passing into the upper 

 cylindrical part of the flask is a hollow 

 porcelain cylinder b, of less diameter than 

 the cylindrical part of flask a. It is closed 

 below, open above, and rests by a pro- 

 jecting rim on the flange of the flask, an 

 asbestos washer, c, being interposed. The 

 fluid to be filtered is placed in the porce- 

 lain cylinder, and the whole top covered, 

 as shown at f, with an india-rubber cap 

 with a central perforation ; the tube d is 

 connected with the exhaust-pump and the 

 FIG. 34. Flask tube e plugged with a rubber stopper. 

 fitted with porcelain When a large quantity of fluid is to be 

 bougie for filtering filt ed a rece ptacle such as that shown 



large quantities of 



fluid. in Fig. 34 may be used. The tap in its 



