28 



of the zincs and platina formerly employed. The zincs were 

 bent round the platina.* 



Cubic Inches. 



Time, 2 minutes, 3' 



After 5 minutes, 2*6 



" Second Experiment. 

 "The zincs being raised out of the acid, cut in two^and 

 re-immersed. 



Cubic Inches, 



Time, 2 minutes, . , 1'6 



After 5 minutes, 1*6 



" Third Experiment. 



" The zincs and platinized silver being removed, the acid 

 remaining untouched ; the platinized silver plates were bent 

 round the zincs. 



Cubic Inches. 



Time, 2 minutes, 2*6 



After 5 minutes, 2-4 



*' Fourth Experiment. 

 " The platinized silver cut in two. 



Cubic Inches. 



Time, 2 minutes, 1 -4 



After 5 minutes, . : , ^'4 



" Supposing from these experiments the same quan- 

 tity of electricity to be developed, whichever of the opposed 

 surfaces of the two metals be the greater, I placed in sepa- 

 rate glasses five zinc cylinders, one-inch diameter, immerged 



• " The most advantageous method of arranging a Sraee's battery is, packing 

 the zincs and platinized silvers in the manner recommended by Dr. Faraday in 

 his 10th series, (also by Mr. Young, Phil. Mag. vol. x. p. 241,) placing the 

 package on supports so as to allow the sulphate of zinc to fall to the bottom of 

 the vessel, while the fresh acid rises to the surface." 



