48 HEAT DEVELOPED DURING ELECTROLYSIS. 



converts into an absolute measure by determining the 

 current which passed through the wire, 2-26, under the 

 electromotive force sufficient to electrolyze water. With 

 these units he finds that the heat generated by a current in 

 stationary metal conductors is given by the product of the 

 co-efficient 2*14 multiplied by the electric action, or of 

 the current multiplied by the electromotive force and the 

 co-efficient 2*14. 



He then proceeds, by the aid of this heat equivalent of 

 electric action, to determine " The Heat developed during 

 Electrolysis." To determine the resistance of the pairs he 

 completes the circuit with various conductors of different 

 resistances which he has carefully deduced, and then, by 

 measuring the currents caused, he deduces, by "Ohm's law," 

 the resistance of the pair in his standard units. He then 

 measures the heat developed by measuring the capacity for 

 heat, and the rise of temperature of the cell, and correcting 

 for radiation, conduction and the heat generated by the dis- 

 solution of oxides, finds that the heat produced by the 

 resistance of the pair follows the same law and quantitative 

 relations as that produced in metallic conductors. 



He then investigates the reverse process, and determines 

 the heat produced by the passage of electricity through a 

 decomposing cell, and compares this with the " resistance to 

 conduction " in such cells, as distinct from the electromotive 

 force necessary to cause electrolization — " resistance to 

 electrolyzation " — in the cells. He has, therefore, first to 

 determine this "resistance to electrolyzation." This he 

 does by determining the part of his battery of 20 zinc-iron 

 pairs which is necessary to overcome this resistance (3^3 

 pairs), and then, as before, by the aid of conductors of 

 known resistance, deduces by " Ohm's law " the resistance 



