634 



BRIDGMAN. 



written in this form, the pressure of maximum deviation would be 

 approximately 3000 instead of 6000 kg. The closest approach to it is 

 by Au and Cu at 0°, for which the pressures of maximum deviation are 

 4440 and 4200 respectively. The fact that the pressure of maximum 

 deviation is so much above 3000 kg. for most metals means that the 

 instantaneous coefficient becomes markedly less at the higher pressures. 

 This is brought out in Table XXIII, in which the instantaneous 



TABLE XXIII. 

 Comparison of Instantaneous Pressure Coefficient at 0° and kg 



WITH that at 0° AND 12000 KG. 



coefficients at 0° are compared at kg. and 12000 kg. The instanta- 

 neous coefficient at 12000 kg. was obtained by dividing the value al- 

 ready given in the tables by the resistance at 12000. Such a decrease 

 of pressure coefficient with pressure is perhaps surprising after finding 

 the constancy under pressure of the temperature coefficient. The dis- 

 placement of the pressure of maximum deviation towards higher 



