580 



MR. F. E. SMITH, MR. T. MATHER, AND DR. T. M. LOWRY 



two similar voltameters in series, the one containing the least quantity of solution does 

 in general give the smaller deposit. This is well illustrated in 77 'c and d. In one of 

 these, 450 cub. centims. of an abnormal electrolyte gave 1 '12007 as the value of the 

 electrochemical equivalent, while the other, which contained 150 cub. centims., gave 

 I'll 923. With an abnormal electrolyte a large bowl will therefore give a heavier 

 deposit than a small one, but although there is an appreciable difference in the size of 

 the Rayleigh bowl and the Richards crucible which Professor VAN DIJK used, we do 

 not think that the differences which he observed are to be entirely attributed to this 

 cause. 



Professor WATSON also sent a silver nitrate solution used by him in 1895. This 

 gave I'll 872 (23a) for the electrochemical equivalent, and when diluted to a 7 per 

 cent, solution it gave 1'11850 (60a) with a current of 2'3 amperes, and 1'11837 (61a) 

 on a second electrolysis with a current of O'l ampere. 



In view of these facts and the great difference in the size of the voltameters, &c., 

 used by other observers, it appears that no very useful purpose would be served by 

 an attempt to explain the results of other experimenters without first reproducing as 

 nearly as possible the conditions under which they worked. This we shall endeavour 

 to do. 



It is of some interest, however, to compare the results obtained by absolute 

 methods, since a form of voltameter practically identical with that used by Lord 



TABLE X. 



* MASCART, ' J. de Phys.,' 3, p. 283, 1884. 

 t FR. and W. KOHLBAUSCH, ' WIED. Ann.,' 27, p. 1, 1886. 

 \ RAYLEIGH and SIDGWICK, 'Phil Trans.,' 175, p. 411, 1884. 

 PELLAT and POTIER, ' J. de Phys.,' 9, p. 381, 1890. 

 || KAHLE, 'Zeitschr. Inst.,' 18, pp. 229-267, 1898. 

 U PATTERSON and GUTHF, ' Phys. Rev.,' 7, p. 257, 1898. 

 ** PELLAT and LEDUC, 'C. R.,' 136, 1649, 1903. 



ft VAN DIJK and KUNST, 'Ann. der Phys.,' 14, p. 569, 1904. VAN DIJK, 'Ann. der Phys.,' 19, 

 p. 249, 1906. 



\\ GUTHE, ' Bull. Bureau of Stands.,' vol. 1, No. 1, p. 36, 1904, and vol. 2, p. 70, 1906. 



