226 



ELECTROLYSIS. 



The work absorbed by a resistance E which is traversed by 

 a current of an intensity 0, is given by the formula : 



w = 5. 



If we apply this formula to the three applications which 

 are actually being analysed we find : 



Marseilles 



22Q~ 2 x 0-0184 (89-06 kgm. = about 

 W -^^- - = ^ 



Hamburg W! = 

 Birmingham W a = 



265 '* 



9-81 



X 0-2054 

 9-81 



= 705 kgm. = 9-5 h.p. 

 = 1107'6kgm.=14-7h.p. 



The work absorbed by the metallic resistances is very small, 

 and can be reckoned at 1 per 100 of the work absorbed by the 

 bath. 



The polarisation of the electrodes, which particularly depends 

 on the composition of the raw coppers, consumes a mechanical 

 energy varying between 5 and 10 per 100 of the total work. 



Lastly, the efficiency of the machines attains 90 per 100 

 with a good utilisation, and decreases to 70 per 100 when the 

 machine heats and is not kept in good working order. 



Knowing the elements of the three preceding installations, 

 we have been able to establish with sufficient correctness the 

 following table, which can be used as a basis to a project : 



