964 Transactions of the American Institute. 



Example. 



53. Suppose, v 1 === 154 CO. in 200 minutes. 



V = 760 »/». 

 I = 757 " 

 e = 18.5 * 

 t = 21° C. 



v = 154 x 273 _ 42042 UB 

 273 + 21 ~~ 294 ~~ 



757 — 18.5 — T 38 ; 5 ^ .9755 

 757 



v = 143 x .9755 =139.5 C.C. in 200 min. 



= .6975 C.C. per minute. 



= .01162 " second. 



Reducing this to vebers, 



.1721 C. C. : 1 veber : : .01162 C.C. : .067518 vebers per second. 



54. Now, dividing this product by the mean tangent of the galvano- 

 meter deflection under which it was produced, 



1.1189 gives .060343, a constant multiplier, 

 by which we may multiply the tangent of any deflection of that same 

 galvanometer, and thereby obtain the equivalent of the current pro- 

 ducing it, in vebers per second. 



55. We may now obtain the weight in grains per second, of any 

 metal or element, whose salt we may submit to electrolysis, with this 

 galvanometer in circuit, by simply multiplying the tangent of deflec- 

 tion by this constant, the product by .000158 grains (the hydrogen 

 equivalent of one veber per second), and this product by the chemical 

 equivalent of the element. 



Example. 



56. Suppose a salt of copper has been submitted to the same current 

 with the voltameter in the preceding example, how much copper 

 would have been deposited per second ? 



Tan. 1.1189 x constant, .060343 x .000158 grs. hydrogen x 31.7 



chem. equivalent of copper. 

 = .000338 grs. copper per second. 

 = .0203 " " minute. 



Multiplying .6975 C.C. per minute by .0292, the copper equivalent 

 of 1 C.C. gives the same answer ; .0203 grains copper per minute ; 

 thus verifying the calculation. 



57. Hence we have the following 



