614 



BRIDGMAN. 



Within the Hmits of error the departure from linearity is parabolic 

 and symmetrical, and is sufficiently characterized by the numerical 

 values in Table XV. 

 The mean coefficient between 0° and 100° listed above, 0.003868, 



TABLE XV. 



Platinum. 



was obtained during the pressure measurements. This was somewhat 

 lower than the value found by Professor Davis for the same piece, 

 0.003905, before it had been subjected to pressure. His value is high 

 and indicates the highest purity. The same abnormal deviation from 

 linearity with temperature was found as for palladium. The deviation 

 was too small to be sure of quantitatively, and in the table the relation 

 is given as linear. 



IS .0,3 



.§.2 

 X > 



to 4; 



SQ.0,2, 



0" 20° 40° 60° 80° 100° 

 Temperature 



»; c-0)l9 H l il ! !h i lli:^' '^" 



'^c3-°*'V 20"~4O' 60^ 80° 100° 

 Temperature 

 Platinum 



Figure 17. Platinum, 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. 



