406 



Tables 477-479 



TABLE 477.— Peltier Effect 



The coefficient of Peltier effect may be calculated from the constants A and B of Table 467. as 

 there shown. With Q (see Table 467) in microvolts per ° C and T= absolute temperature (K), 



the coefficient of Peltier effect= cal. per coulomb=o. 00086 QT cal. per ampere-hour=Qr/iooo 



4- 

 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 are not of great value. 



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



t " Ann. de Chim. et de Phys. 1 ' (4) vol. 10, p. 201. 



t Becquerel's antimony is S06 parts Sb + 406 parts Zn -f- 121 parts Bi. 



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



TABLE 478.— Peltier Effect, Fe-Constantan, Ni-Cu, 0° — 560°C 



TABLE 479. — Peltier Electromotive Force in Millivolts 



Le Roux, 1867; Jahn, 1888; Edlund, 1870-71 j Caswell, Phys. Rev. 33, p. 381, 191 1. 

 Smithsonian Tables. 



