3'20 



TABLES 390-391. 



THERMOELECTRIC PROPERTIES: PRESSURE EFFECTS- 

 TABLE 390. Thermoelectric Power; Pressure Effects. 



The following values of the thermoelectric powers under various pressures are taken from Bridgman, Pr. Am. Acad. 

 Arts and Sc. 53, p. 269, 1018. A positive emf means that the current at the hot junction flows from the uncompressed 

 to the compressed metal. The cold junction is always at o C. The last two columns give the constants in the 

 equation E = thermoelectric force against lead (o to 100 C) = (At + BP) X io~ volts, at atmospheric pressure, a 

 positive emf meaning that the current flows from lead to the metal under consideration at the hot junction. 



TABLE 391. Peltier and Thomson Heats; Pressure Effects. 



They refer 

 itive if heat is absorbed by the positive 



The following data indicate the magnitude of the effect of pressure on the Peltier and Thomson heats. 

 to the same samples as for the last table. The Peltier heat is considered positive if heat is absorbed by 

 current from the surroundings on flowing from uncompressed to compressed metal. A positive <PE/dP means a larger 

 Thomson heat in the compressed metal, and the Thomson heat is itself considered positive if heat is absorbed by the 

 positive current in flowing from cold to hot metal. Same reference and notes as for preceding table. 



* t t Same significance as in preceding table. 



SMITHSONIAN TABLES. 



