EFFECT OF PRESSUKE ON CONDUCTIVITY OF METALS. 



105 



The best results were obtained with the first of the radial flow speci- 

 mens listed above. The results with this specimen are reproduced 

 in Figure 5. The same departure from linearity which was shown by 

 lead is shown here also. 



The average of the results listed above gives a mean pressure 

 coefficient to 12000 kg. of thermal conductivity of + O.O4I22 per 

 kg/cm^. The corresponding coefficient of electrical conductivity is 

 + O.O5929. 



6 7 



Kg. / Cm. X 

 Tin 



Figure 5. Tin. Thermal conductivity on an arbitrary scale against pres- 

 sure in thousands of kg/cm^. Results obtained with a radial flow specimen. 



Lussana ^ found for the average coefficient of thermal conductivity 

 to 2600 atmospheres 0.0.5719 (pressure expressed in kg/cm^). Lus- 

 sana's relation was not linear, but there was a falling off of the coeffi- 

 cient of 19% between and 2600 , atmospheres. Up to 2600 atmo- 

 spheres Lussana found the relation between pressure and the electrical 

 resistance of tin to be linear, and the value of the coefficient O.O582O. 

 In my previous work I have found the relation to be sensibly not 

 linear, and the initial value of the coefficient to be O.O4IO55. 



