28 



of the zincs and platina formerly employed. The zincs were 

 bent round the platina.* 



Cubic Inches. 



Time, 2 minutes, 3* 



After 5 minutes, *'" 



" Second Experiment. 

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

 re-immersed. 



Cubic Inches. 



Time, 2 minutes, 1*^ 



After 5 minutes, 1'" 



" 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, . ; 1-4 



" 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 Smee'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. %, 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." 



