Table 254. 

 COMPOSITION AND ELECTROMOTIVE FORCE OF BATTERY CELLS. 



Name of cell. 



Negative 



pole. 



I'' line |.iilr. 



K M. r 



ill Milts. 



(b) SlNt-LK Fli;iI> liATTIiKIB.S. 



Leclanche . . . 



Chaperon . . . 

 Edison-Lelande . 

 Chloride of silver 

 Law 



Dry cell (Gassner) 



Poggendorff 



J. Regnault . . 

 Volta couple . 



\ Solution of sal-ammo- | 

 ( niac ( 



j Solution of caustic | 

 I potash j 



23 % solution of sal- j 

 ammoniac . . . j 



I pt.''zn(), I pt.NH4Cl, ■ 

 3 pts. plaster of paris, 

 2 pts.ZnCl.j, and water 



to make a paste . . 



Solution of chromate 

 of potash .... 



12 parts K.jCroOT + 

 25 parts H.2S04 + 

 100 parts FL>() . . 



I part 11.2804 + 

 1 2 parts H.2O + 

 I part CaS04 . . 



H.,0 



Carhoii stirround- 

 cd Ijy powdered 

 carbon and perox- 

 ide of manganese 



Copper and CuO 



Silver surrounded 

 by silver chloride 

 Carbon .... 



Cadmium 

 Copper . 



1.46 



0.98 

 0.70 

 1.02 

 '•37 



•■3 



1.08 



2.01 



0-34 

 0.98 



(c) Standard Cells. 



Kelvin, Gravity, 

 Daniell . 



:} 



Clark standard . 



Bailie & Ferry 



Gouy 



Amal. zinc 



.1 



ZnS04 solution, den- 

 sity 1.40 . . . 



Mercurous sulphate in 

 paste with saturated 

 solution of neutral 

 ZnS04 



Zinc chloride, density | 



1-157 i 



( Oxide of mercury in a ) 

 ] 10 % sol. of ZnS04 [ 

 ( (paste) ) 



Electrolytic cop- 

 per in CUSO4S0I. 

 density i.io . . 



Mercury. . . . 



Lead surrounded 

 by powdered 

 PbCla . . . . 



Mercury , 



1.072 [i 

 — .00016 

 (/-1 5)] 



1-434 [I 



— .00077 



(^—5)] 

 ' 0.50 tem- 

 perature 

 coefiic't 

 about 

 .00011 



1-3^^7 [I 

 — .0002 

 (/-1 2)] 



Lodge's standard cell and Fleming's standard cell are, like the Kelvin cell above, modifications of the Dan- 

 iell zinc-zinc sulphate, copper-copper sulphate cell. 



(d) Secondary Cells. 



Faure-Sellon- | 

 (Volckmar) . f 



Regnier (i) . . 



" (2) . . 

 Main .... 



Lead . . 



Copper . 



Amal. zinc 

 Amal. zinc 



j H0SO4 solution of 

 I density i.i . . . 



CUSO4 + H.2SO4 . . 



ZnS04 solution . . . 

 H.2SO4 density ab't i.i 



PbO.2 



" in H.2SO4 



'y *>♦ 



1.68 to 

 0.S5, av- 

 erage 1.3. 

 2.36 

 2.50 



• F. Streiutz gives the following value of the temj^rature variation — — at dififerent degrees of charge : 



at 



Smithsonian Tables. 



247 



