i 1894.] Thermo-electric Properties of Salt Solutions. 



Fro. 5. 



307 



D 



E 



AA' are two beakers containing one of tlie liquids under examination, which we 



will call No. 1. 

 BB' are two thermometers for telling the temperature of the liquid in the 



beakers. 

 C is a bent tube full of No. 1 liquid, which is continuous between the end of 



C, which is under the liquid in A', and in which the electrode F' dips. 

 D is a syphon tube connecting the liquids in AA' ; it is full of liquid No. 2, 



and is closed at its ends by porous plugs, EE', made of porous earthen- 



ware and fixed with shellac. 

 FF' are the electrodes, F being in beaker A, and F' in tube 0, close to F, the 



bent part of C being in the beaker A. 



The following results were obtained : 



With zinc sulphate 4 per cent. No. 1, zinc chloride weak as No. 2. 

 E/(' i) 1'36 X 107 4 V for two observations with temperature 

 differences 36'4 and 29'4. 



With zinc acetate as No. 2 

 '-=15-6 

 t'-t--28-0 

 t'-t = 30-3 



'-0 =0'8xlO- 4 V 

 '-0 = 1-05x10-* V 

 ' = 1-13 



The latter are not so good as the first on zinc chloride, which gives 

 about what we might expect from the difference of the 's of the two 



