70 



BRIDGMAN. 



this would mean an average coefficient between 0° and 177.8° even 

 larger than 0.00458. 



The independent pressure runs at different temperatures did not 

 fit as smoothly together as they frequently do, but the pressure effect 

 varied irregularly from one temperature to another. Within the 

 limits of error a dependence of pressure coefficient on temperature 

 could not be established, and in the finally smoothed results the pres- 

 sure coefficient is assumed independent of temperature. This de- 

 manded a maximum readjustment of the observed readings of 2.0% 

 at 75°. 



TABLE I. 



Resistance of Lithium. 



Average coefficient to 12000 kg. + 0.05772. 

 This coefficient is independent of temperature. 



The values of the resistance of the solid at 25° intervals of tempera- 

 ture and 1000 kg. intervals of pressure are shown in Table I. The 

 pressure coefficient is seen to be positive, as already noted. Further- 

 more, the pressure coefficients, both instantaneous and absolute, 

 increase with increasing pressure. This we would not expect, but it 

 seems to be the normal type of behavior for substances with positive 

 coefficient. 



The second series of measurements was made with another sample 

 of lithium, much larger in amount, which I obtained through the kind- 



