377 



TABLE 374.— COMPOSITION AND ELECTROMOTIVE FORCE OF VOLTAIC CELLS 



The electromotive forces given in this table approximately represent what may be expected 

 from a cell in good working order, but, with the exception of the standard cells, all of them are 

 subject to considerable variation. 



Part 1. — Double fluid cells 



Name 

 of cell 



Bunsen 

 Chromate 



Daniell 

 Grove 



Partz 



Negative 



pole Solution 



Amalg. Zn l,H 2 SO, ;12,H 2 



" 12,K 2 Cr 2 0,; 25,H 2 S0 4 ; 



100,H 2 O 



" 1,H 2 S0 4 ; 12,H 2 



" 1,H 2 S0 4 ; 4,H 2 



" l,H,SO«; 12,H s O 



" 5%sol.ZnS0 4 ;6H 2 



" INaCI; 4 parts H 2 



" 1H 2 S0 4 ; 12H 2 



" Sol.ZnSO. 



" H 2 S0 4 sol.; dens. 1.136 



" H 2 SC> 4 ; dens. 1.136 



" H,SO« sol.; dens. 1.14 



" H,S0 4 sol.; dens. 1.06 



" NaCl sol. 



" Sol.MgSO* 



Part 2. — Single fluid cells 



Leclanche 



Chaperon 



PMison-Lelande 



AgCl 



Law 



Dry cell 



Poggendorff 



Regnault 

 Volta couple 



Amalg. Zn 



Zn 



Amalg. Zn 



Zn 



1.46 

 .98 

 .70 



1.02 



1.37 



1.3 



1.08 

 2.01 



.34 

 .98 



* Depolarizer: Manganese peroxide with powdered carbon, 

 chloride. 



t Depolarizer: CuO. t Depolarizer: Silver 



Part 3. — Secondary cells 



SMITHSONIAN PHYSICAL TABLES 



