610 



BRIDGMAN. 



TABLE XIII. 

 Iron. 



symmetrical and parabolic, and is therefore sufficiently characterized 

 by the mean value in the table without graphical representation. 



Iron was the first substance on which I made measurements, and 

 many runs were made before the difficulties of temperature control 

 were overcome, or the best methods of manipulation discovered. ^ All 

 the earlier results agreed within their larger limits of error with the 

 final results. 



$.0,225, 

 a! 



'0'> 20-' 40° 60" 80" 100° 



Temperature 



Iron 



Figure 15. Iron, results for the measured resistance. The ^deviations 

 from linearity 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. 



