TABLE 383 (continued}. 313 



COMPOSITION AND ELECTROMOTIVE FORCE OF VOLTAIC CELLS. 



*The temperature formula is E,= E 20 0.0000406 (t 20) 0.00000095 (t 20 ) 4-0-0000000 1 (t ao). 

 t The value given for the Clark cell is the old one adopted by the Chicago International Electrical Congress in 1893. 

 The temperature formula is E t = E 15 0.00119 (t 15) 0.000007 (t 15)*. 



t F. Streintr gives the following value of the temperature variation at different stages of charge : 



at 



E. M. F. 

 dE/dtXio 



1.9223 

 140 



1.9828 



228 



2.0031 

 335 



2.0084 

 285 



2.010$ 

 2 55 



2.2070 

 73 



Dolezalek gives the following relation between E. M. F and acid concentration : 

 Per cent H,SO 4 64.5 52.2 35.3 21.4 5.2 

 E.M.F., oC 2.37 3.25 2.10 2.00 1.89 



SMITHSONIAN TABLES. 



