1888.] Voltaic Couple by Variation of Strength of Liquid. 297 



Table I. — KC10 3 in 465 grains of Water at 16° C. 



Grains. 



Volts. 



Grains. 



Volts. 



39 



1 -0228 



18 



1 -0171 



36 





15 



10142 



33 



» 



12 



1 -0056 



30 



>> 



9 



0-9999 



27 



»> 



6 



0-9828 



24 



>> 



3 



-9282 



21 







The strongest of the above solutions was a saturated one. 



Table II.— Ditto at 10° C. 



Grrains. 



Yolts. 



Grains. 



Yolts. 



3 



-9282 



2-1 



0-9170 



2-7 



0-9227 



1-8 



-9084 



2-4 



-9198 



"Water alone. 



n 



The electromotive force gradually increased with the strength of the 

 solution until 21 grains of the salt had been added ; it then remained 

 uniform up to the point of saturation. The total increase of electro- 

 motive force was OH44 volt. The smallest proportion of salt 

 required to upset the balance of the couple was 1 part in between 

 221 and 258 parts of water. 



Table III.— KC1 in 465 grains of water at 12° C. 











Grains. 



Yolts. 



Grains. 



Yolts. 



147 



1-15136 



57 



1-15436 



129 





39 



n 



111 



>> 



21 





93 





3 



» 



75 









The strongest of these solutions was saturated with the salt. 



