294 MORRIS LOEB 



The crucible is made on a rather taller and narrower pattern 

 than is usual, and it fits quite snugly into the upper portion 

 of the cup [301] of the siphon. The two are united by a bit of 

 rubber drawn over the junction; the rubber should be freed 

 from sulphur, although there is no real danger of contact with 

 the silver solution. 



The apparatus is filled with the silver nitrate solution, so 

 that the top of the siphon is not quite reached and is set upon 

 the stand, Fig. 2. After the completion of the electrolysis, 

 adding a little liquid causes the siphon to act and to drain 

 off every drop of nitrate solution, without in any way dis- 

 turbing the deposit; the lixiviation with hot water is equally 

 expeditious, and the crucible can then be detached from the 

 siphon, dried and weighed. 



The stand for this voltameter is seen in Fig. 2. The crucible 

 is hung in a brass block, the conical hole in which fits exactly 

 around its upper third; to this block the negative wire of the 

 circuit is to be attached. 



The positive wire is connected with a long horizontal cone, 

 which is isolated from the cast-iron base, and from which the 

 silver cone that forms the anode is suspended within the 

 crucible by a silver wire. 



