382 TABLE 381.— THOMSON EFFECT IN MICROVOLTS PER DEGREE 



TABLE 382.— THERMOELECTRIC EFFECTS; PRESSURE EFFECTS 



The following values of the thermoelectric effects under various pressures are taken from 

 Bridgman. A positive emf means that the current at the hot junction flows from the uncom- 

 pressed to the compressed metal. The cold junction is always at 0°C. The last two columns give 

 the constants in the equation E = thermoelectric force against lead (0° to 100°C) = (At + Bt*) 

 X 10~ 6 volts ; at atmospheric pressure, a positive emf meaning that the current flows from lead to 

 the metal under consideration at the hot junction. 



Thermal emf, volts X 10 B 

 Pressure, kg/cm 2 



2000 



4000 



8000 



Temperature, °C 



12,000 



Formula 

 coefficients 



SMITHSONIAN PHYSICAL TABLES 



