OP ARTS AND SCIENCES. 



239 



potash. The current was approximately 5 amperes. The equation 

 r = a -j- W still expressed the results as follows : — 



TABLE XIX. 



The values of the inverse electromotive force were for biborate of 

 soda 6.38 volts, for sulphate of soda 10.86 volts, and for sulphate 

 of potash 9.03 volts. The conductive resistance, as well as the inverse 

 electromotive force, is diminished by the presence of the salts in the arc. 



The data from which the curves giving the preceding equations 

 were constructed, are given in the following tables. 



TABLE XX. 

 Biborate of Soda. 



Current = 5. 10 amperes. 



TABLE XXL 



Sulphate of Soda. 



Cnrrent = 4.94 amperes. 



TABLE XXIL — Sulphate op Potash. 

 Current = 5.10 amperes. 



