576 



AGRICULTURAL ANALYSIS 



come narrow. The space below the anode is filled with glass 

 beads to support the platinum disk. About five centimeters- 

 from the top of the tube three shoulders are moulded into the 



Fig. 47. Apparatus for Making Pure Chlorplatinic Acid. 



tube and on these the cathode chamber is suspended, as shown inr 

 the figure. This chamber consists of a porous porcelain filter 

 about 1 8 centimeters long and 25 millimeters in diameter. The 

 cathode consists of a sheet of platinum from four to five centi- 

 meters long and from two to three centimeters wide, carrying 

 a platinum wire passing through a glass tube as shown. This 

 tube is suspended from a perforated watch glass which serves 

 also as a cover for the apparatus. The whole apparatus is sus- 



