THERMO-ELECTRIC QUALITY UNDER PRESSURE. 



349 



previous run at 75°, and in the direction necessary to make the points 

 at 75° lie smoothly with those of other temperatures. The pressure 

 runs on Baker's platinum were accomplished without incident. Two 

 applications of 12000 were made at room temperature to season. 



30° 40° 50° 60° 70° 80° 90° 100° 

 Temperature 

 Commercial Platinum 



Figure 35. Baker's Platinum. Thermal E.M.F. of a couple composed 

 of one branch of uncompressed metal, the other compressed to the pressure 

 in kg./cm.- indicated on the curves, the junctions being at 0°C and the temper- 

 ature plotted as abscissae. 



Equilibrium was reached so rapidly as to suggest no shifting of internal 

 equilibrium. 



For the Heraeus platinum, the maximum departure of any single 

 observed point from a smooth curve was 7.8% of the maximum 



