Table 259. 



THERMOELECTRIC POWER OF METALS AND SOLUTIONS.* 



Thermoelectric power of circuits, the two parU of which are either a metal and a solution of a salt of that metal or 

 two solutions of salts. The cot.centration of the solution was such that .., .000 parts of the solution there was 

 one half cramme equivalent of the cr>'stailized salt. The circuit is indicated symbohcally ; for example, Lu and 

 CUSO4 indicates that the circuit was partly copper and partly a solution of copper sulphate. 



Substances forming circuit. 



Cu and CUSO4 . 



Zn and ZnS04 



Cu and CuAc (acetate) 



Pb and PbAc 



Zn and ZnAc 



Cd and CdAc 



Zn and ZnCl^ 



Cd and CdCl.2 



Zn and ZnBr.2 



Zn and Znlo 



Cd and Cdl2 



CUSO4 and ZnS04 

 CuAc and ZnAc . 

 ZnAc and CdAc . 

 CuAc and CdAc . 

 PbAc and ZnAc . 

 PbAc and CdAc . 

 PbAc and CuAc . 

 ZnCl2 and CdCli 

 ZnBr2 and CdBr2 

 Znl2 and Cdl2 



Thermoelec- 

 tric power in 

 microvolts. 



754 

 760 

 660 

 176 

 693 



503 

 562 



562 



632 



602 



594 



40 

 8 

 o 

 o 



1?, 

 54 



9 



15 

 82 



Insoluble salts mixed with a solution of 

 the corresponding zinc or cadmium salts 

 for the purpose of acting as a conductor. 

 The other part of the circuit was the metal 

 of the insoluble salts. The results are com- 

 plex and of doubtful value. 



Substances forming circuit. 



Ag and AgCl in ZnCl2 

 Ag and AgCl in CdCl2 

 Ag and AgBr in ZnBr2 

 Ag and AgBr in CdBr2 

 Ag and Agl in Znl2 . 

 Ag and Agl in Cdl2 . 

 Hg and IlgoCU in ZnCl2 

 Hg and Hg2Cl2 in CdCl2 

 Hg and Hg2Br2 in ZnBro 

 Hg and Hg2Br2 in CdBr2 

 Hg and Hg2l2 in Znl2. 

 Hg and Hg2l2 in Cdl2 



Thermoelectric 



power in 



microvolts. 



143 

 310 



327 



461 



414 



unsuccessful 



680 



673 

 650 

 8iq 

 948 

 891 



Tables 260, 261 . 



PELTIER EFFECT. 



TABLE 260. —Jahn's Experiments. t TABLE 261. — Le Roux's Experiments.t 



Current flows from copper to metal mentioned. Table gives therms per ampere per hour, and current flows 

 Table gives therms per ampere per hour. from copper to substance named. 



* Gockel, " Wied. Ann," vol. 24, p. 634. 



t " Wied. Ann."' vol. 34, p. 767. 



t " Ann. de Chim. et de Phys." (4) vol. 10, p. 201. 



§ Becquerel's antimony is 806 parts Sb +406 parts Zn + 121 parts Bi. 



II Becquerel's bismuth is 10 parts Bi + 1 part Sb. 



Smithsonian Tables. 



250 



