Manchester Memoirs, Vol. XL VIII. 



Plate VII. 



W. TJwiiisoii's Electrolytic Apparatus. 



Fiz. 1. 



Fig. 2 shews the rate at which the Arsenic is removed from a solution, 

 containing '-yVh of a grain of As^Og per gallon — 50 c.c. being used, in the 

 apparatus shewn in Plate I. (A) with 5 amperes, (B) with 3 amperes of 

 current. The mirrors shewn were obtained during periods of 5 minutes till 

 all the Arsenic was removed. 



A 



using 5 amperes 

 with cooling. 



using 3 amperes 

 ■with cooling. 



blank 1st 2nd 3rd 4th sth 6th 7th 8th five minutes 



:=40 minutes for the test. 

 Fig. 2. 



