37 



breadth 0-3, the depth 3-5. Theuumber of alternations was 

 five. 



Cubic Inches. 



Time, 2 minutes, 8-0 



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



)} )» ^o J, .... o'O 



>j « 1 hour, .... 1*0 



>j „ 19 hours, .... none 



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



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 mmutes, 8* 



After 10 minutes, 8" 



j» 25 „ 8" 



" Third Experiment. 



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

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

 ofgas after the Isi^seoi forty-eight hours, shewing the advan- 

 tage of having a large supply of sulphuric acid.* 



" Experiments with Smees Battery of Platinised 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 expertments repeated with 

 unglazed porcelain gave 1 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 



