206 ELECTROLYSIS. 



Weight of the plates .. .. 12 kilogrammes. 



Height of immersion of each plate .. .. 0' 58 metre. 



Thickness of cathodes 0*0005 



Distance between the anodes and the cathodes ' 05 



Total weight of the copper treated . . . . 55 tons. 



Gramme machine used No. 1. 



Number of revolutions per minute .. .. 850 



Weight of copper refined per hour . . . . 10 * 40 kilogrammes. 



Weight of copper refined per day 250 



Weight of fuel consumed per day . . . . 240 



Motive power required 5 H.-P. 



The bath is composed of dilute sulphate of copper at 16 to 18. 

 The temperature is maintained constant at 25 C. 



M. Koux's complete installation : baths, Gramme machine, 

 and steam-engine, cost 1000?. The invested capital reaches 

 5000Z. to 60007. 



THE ELLIOTT METAL COMPANY, LIMITED, WORKS. This 

 company, whose works are at Selly Oak, near Birmingham, 

 refine 10 tons of copper per week. The current is produced 

 by five Wilde dynamo-electric machines. Each machine feeds 

 forty-eight baths joined in series. 



The baths are 0*90 metres long by 0'90 metres wide and 

 1*20 metres high; they are lined with baked earth and a layer 

 of asphalt. Each bath contains 16 anodes having 0*625 metre 

 ]ength by 175 metre width and 0125 metre thickness. The 

 weight of one anode is 125 kilogrammes. There are 10 cathodes 

 for each bath; they are 0*425 metre long by 0*400 metre 

 wide and 0008 metre thick. The weight of one cathode is 

 1*30 kilogramme. 



The total weight of copper contained in a bath is 205 kilo- 

 grammes, and the total weight of copper contained in a battery 

 of 48 baths is 9840 kilogrammes. 



The [distance between the cathodes and the anodes is 

 0-0875 metre. 



The anodes are immersed in the baths of 500 metre, so 

 that the immersed surface is 0*5 metre x 0*175 metre = 

 0*0875 square metre for one side, and 0*1750 square metre 

 for the two sides. The total immersed surface of anodes per 

 bath is therefore 2 80 square metres. 



