608 



BRIDGMAN. 



total resistance, but after the first application of pressure the zero 

 drift was no greater than for most substances. 



Runs were made at only three temperatures, 0°, 50°, and 100°. 

 I hoped at the time that a purer sample would be available and 

 intended this run for orienting purposes, but the purer sample has 

 not yet been successfully prepared. 



The smoothed results are collected in Table XII, and the experimen- 



• 



TABLE XII. 

 Cobalt. 



tal values of the mean coefficient and maximum departure from linear- 

 ity in Figure 14. The pressure coefficient of cobalt is smaller than 

 that of any other substance which I have found; one would, there- 



40° 60" 60° 

 Temperature 

 Cobalt 



Figure 14. Cobalt, 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 deviation curves. The pressure coefficient is the average 

 coefficient between and 12000 kg. 



