250 Goocli and Beyer — Use of the Filtering Crucible. 



funnel (D), which serves to prevent spatteriug of the liquid 

 during the electrolysis, and hangs within the glass chamber. 

 The cell, held by a clamp, may be kept cool during action by 

 immersing it in water contained in a cooler, as indicated in 

 figure 2. 



Electrical connection is made with the crucible by means of 

 a platinum triangle (<?) bent as shown and held tightly against 

 the outer wall of the crucible by a rubber band (d). Figure 

 2 shows, on the left, the apparatus adjusted for work. 



In using the apparatus, the crucible fitted with asbestos and 



containing clippings of platinum foil, is capped, ignited and 

 weighed. The glass chamber with the wide rubber band 

 folded back against itself is set upon the crucible and the band 

 is snapped into place. The other adjustments are made in the 

 manner shown. The electrolyte is introduced and the current 

 turned on. After the expiration of time enough to complete 

 the electrolysis, the cooler is lowered and arrangements are 

 made to draw off the liquid in the cell. If the process is such 

 that no harm can follow the stopping of the current before 

 removing the liquid, the upper electrode and funnel are washed 

 and removed, the cap and band are slipped off, and the appar- 

 atus is set in the holder of the filtering flask as for an ordinary 



