ON THK SILVER VOLTAMETER. 



That the porous pots were sufficiently close-grained to keep the anode and kathode 

 li|iiiils apart is shown on p. 566. The results obtained with pots soaked in nitric 

 acid, and afterwards in- several lots of distilled water for about 2 to 4 days, an 

 given in 22a, 34r, 34d, 44rf, 46a, 32a, 396, 4 la, 4 id, 42a, 42c, 456, and 45c. 

 These values are in fairly good agreement with one another, but all are lower than 

 the figure obtained for the Rayleigh form. 



The Syphon, Pot-Syphon-Bowl (P.S.B.), and Syphon-Pot-Bowl (S.P.B.) -Forms 



(Table V.). 



The results for the syphon form and for the P.S.B. and S.P.B. types are mainly 

 comparative, the Rayleigh form being taken as the standard. The P.S.B. and S.P.B. 

 types give the effect of the porous pot and clearly indicate that the low results of the 

 early experiments with the Richards form were due to contamination of the solution 



TABLE V. Comparison of the Syphon, Pot-Syphon-Bowl, and Syphon- Pot-Bowl 

 Voltameters with the Rayleigh Form. The latter is taken as the Standard 

 (1 Coulomb deposits Til 827 Milligrammes of Silver). 



* Porous pots baked in electric furnace after soaking in water. 



t Porous pote soaked in acid and afterwards in water for several days. 



; Al>solute determination. 



by the liquid included in the pot. The result of observation 51c is not comparative 

 (see Table I.), the very large syphon being used on this occasion. The mean value of 

 the electrochemical equivalent is practically the same for the three forms, and agrees 

 also with the values obtained with the Rayleigh and Richards types of voltameter. 



