27 



breadth 03, the depth 3'5. The uumber of alternations was 

 five. 



Cubic Inches. 



Time, 2 minutes, 8*0 



The battery-being at rest for 10 minutes, .... 8-0 



„ 25 „ . . . . 3-0 



„ „ 1 hour, .... 1-0 



„ „ 19 hours, .... none 



" The porous vessel was found filled with sulphate of zinc, 



which stopped the action of the battery. 



'* Second Experiment. 

 " The zinc plates being of the same size as the former pla- 

 tina, and the platina of the same size as the former zincs, 

 the zincs bent round the platina, all other things being as 

 before. 



Cubic Inches. 



Time, 2 minutes, 8* 



After 10 minutes, 8* 



25 8- 



" Third Experiment. 

 "Another battery, the diameter of the cells of which was 

 2| inches, gave a diminution of only one-half of the quantity 

 of gas after the lapse oiforty-eigJit hours, shewing the advan- 

 tage of having a large supply of sulphuric acid.* 



" Experiments with Smees Battery of Platinized Silver. 

 " The acid solution was of the same strength as before, 

 and the sizes of the zincs and platinized silver the same as 



• " The porous vessels were of pipeclay. The same cxpertments repeated with 

 unglaied porcelain gave 10 cubic inches in two minutes ; with very porous pipe- 

 clay, they gave as much as 15 cubic inches in two minutes, shewing the import- 

 ance of attending to the nature of the porous vessel employed." 

 d2 



