604 



BRIDGMAN. 



TABLE X. 

 Copper. 



•2 .0,5 



• 'V 20" 40'^ 60'^ 80° 100° -2 

 Temperature -^ 



0° 20° 40° 60° 80° 100° 

 Temperature 



2 4 6 8 10 12 



Pressure, Kg. /Cm.' X 10' 



&>pper 



Figure 12. Copper, results for the measured resistance. The deviations 

 from linearity are given as fractions of the resistance at kg. and 0°C. The 

 pressure coefficient is the average coefficient between and 12000 kg. 



A fun at 25°, made with the same sample before the apparatus was 

 running as regularly as finally, gave a mean coefficient to 12000 kg. 

 0.16% higher than that found in the final run. 



The temperature coefficient listed in the table, 0.004203, was 

 obtained frorri a coil of the same wire, subjected to the same seasoning 

 but which had not been subjected to the pressure runs. There were 

 somewhat large irregularities in the coil which was subjected to pres- 



