618 



BKIDGMAN. 



are somewhat more irregular than usual, but no consistent error seems 

 introduced by this sort of a connection. 



The smoothed results are shown in Table XVII, and the experi- 



TABLE XVII. 



Tantalum. 



mental values of mean coefficient and deviation from linearity in 

 Figure 19. The zero creep during a run amounted on one occasion to 

 as much as 2% of the total effect, but was otherwise less than 1%. 

 The maximum departure of any single point from a smooth curve 

 was 0.5% of the total effect, and the average departure was 0.1%. 



40^ 60° 

 Temperature 

 Tantalum 



Figure 19. Tantalum, results for the measured resistance. The deviations 

 from hnearity are given as fractions of the resistance at kg. and 0°C. Since 

 the deviations are symmetrical about the mean pressure, there is no need of 

 giving the detailed curves. The pressure coefficient is the average coefficient 

 between and 12000 kg. 



