202 



Dr. C. R. A. Wright on the Determination of 





Maxi- 

 mum. 



Mini- 

 mum. 



Eange. 



Average. 



Effect of substituting for bright silver : — 



+ •017 

 +•100 

 +•025 



+ ■005 



+•006 



1-540 



1-550 



1-640 



1555 



1173 



1-185 



1-278 



1-176 



1-186 



1-277 



•422 



•429 



•535 



•420 



•430 



•535 



+•003 

 +•092 

 + •014 



-•003 



+ 002 



1-518 

 1-529 

 1-615 

 1-544 

 1-163 

 1-169 

 1-261 

 1164 



014 

 •008 

 •011 



•008 



•004 



•022 

 •021 



•02.3 



•on 



•010 

 •016 

 •017 

 ■019 



+ •008 

 +•101 

 + 021 



+ •001 



+ 004 



1-528 



1-536 



1-627 



1-549 



1-1675 



1-1765 



1-2685 



11715 



11805 



1-2725 



•416 



•4235 



•5185 



■4165 



.424 



•519 



Amalgamated silver (liquid) 



„ „ (solid) 



Effect of substituting for electro-copper : — 



Effect of substituting for bright cadmium : — 



Electromotive force of combinations : — 



„ ,, Electro-silver 



„ „ Amalg.silver(liquid) 

 ,r (solid). 





„ ,, Amalg. silver (liquid). 





1-176 -010 

 1-267 -010 

 •411 1 -011 

 •411 1 -018 

 •513 -022 

 •411 1 009 

 •414 -oi fi 



„ „ Amalg. silver (liquid) 





„ ,, Amalg. silver (liquid)... 

 Amalgamated copper — Bright silver 



„ ,, Amalg. silver (liquid) 



•513 



•022 



Volta's Law of Summation. 

 128. The values in this table, together with those quoted 

 above for the ziuc- cadmium and cadmium-copper cells (§§ 

 119 and 121) and those given in Part V. for zinc-copper 

 cells (§ 107), clearly prove that Volta's law holds in the case 

 of the sets of combinations 



f Zn J Cd 



[Cd + tAg - 



(A) 

 (B) 

 (C) 



fZn 

 ICu 



red 



\Cu 



/Cu 



lAg 



rcu 

 U g 



/ Zn 

 Ug 

 /Zn 



U g 

 red 



Ug 



at any rate within the range of possible error due to the 

 somewhat larger ranges of fluctuation in the E.M.F. of silver- 

 containing cells than were observed with zinc-cadmium-copper 

 cells, and to the fact that, although alterations of the oxidi- 

 zable plates in the cells containing silver was avoided as far 

 as possible by only carrying on the observations for one hour 

 and sometimes less, still it was not practicable wholly to avoid 

 this source of inaccuracy. Thus in the three cases respec- 

 tively the following figures are obtained : — 



