-_ 



TABLES 392-394. 



TABLE 392. -Peltier Ettect. 



The -coefficient of Peltier effect may be calculated from the constants A and B of Table 386 as 

 there shown. With Q (see Table 386) in microvolts per ' C. and T= absolute temerature JC 



the coefficient of Peltier effect 





^ cal. per coulomb=o.ooo86 QT cal. per ampere-hour =Qr/iooo 



millivolts (=millijoules per coulomb). Experimental results, expressed in slightly different units, 

 are here given. The figures are for the heat production at a junction of copper and the metal 

 named, in calories per ampere-hour. The current flowing from copper to the metal named, a posi- 

 tive- sign indicates a warming of the junction. The temperature not being stated by either author, 

 and Le Roux not giving the algebraic signs, these results arc not of great value, 



* " Wied. Ann." vol. 34, p. 767. 

 t "Ann. de Chim. et de Phys.'' (4) vol. 10, p. 201. 

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

 Becquerel's bismuth is 10 parts Bi -f- 1 part Sb. 



TABLE 393. Peltier Effect, Fe Constantan, Ni Cu, 0-560 0. 



TABLE 394. - Peltier Electromotive Force In Millivolts. 



Le Roux, 1867; Jahn, 1888; Edlund, 1870-71 ; Caswell, Phys. Rev. 33, p. 381, 1911. 

 SMITHSONIAN TABLES. 



