Mean contact differences of potential in volts; solids with liquids, and liquids with liquids. 
32 
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Cl rH o • . . • • • • • • 
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Mercury. 
Distilled water .... 
C A lum, saturated at 1 
16°-5 C.J 
Copper sulphate, satu-1 
rated at 15° C. . . J 
Copper sulphate solu-1 
tion ; specific gravity, > 
1 -087 at 16°-6 C. . J 
Sea salt; specific gravity, 1 
1-18 at 20°-5 C. . . J 
g Sal ammoniac, saturated 1 
.2 at 15°-5 C. . . . f 
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Y Zinc sulphate, saturated! 
M atl5°-3C. . . . J 
Zinc sulphate solution ; 1 
specific gravity, 1’125 > 
at 16°-9 C. . . . J 
1 distilled water, mixed] 
with 1 saturated solu- 1 
tion zinc sulphate . J 
1 distilled water, mixed ] 
with 3 saturated solu- l 
tion zinc sulphate . J 
Depending on the carbon. 
