112 



BRIDGMAN. 



100° was 0.00634, against 0.0049 for commercial nickel over the same 

 range. Two longitudinal flow samples were made from this pure 

 material. 



The first of these samples gave points lying on three different lines 

 separated by the usual 5%. The slope corresponded to a decrease of 

 conductivity of 13.5% for 12000 kg. In setting up the second sample 

 I made the attempt to prevent motion of the thermo-couple wires in 

 the holes with a piece of 0.002 inch wire laid beside them, as has been 



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1 2 3 4 3 6 7 8 9 10 11 12 



Pressure. Kg./Cm.'X lO'^ 



Nickel 



FiGTJRE 9. Nickel. Thermal conductivity in arbitrary units against 

 pressure in thousands of kg/cm^ Results obtained with a longitudinal flow- 

 specimen. The points lie on several lines of the same slope; the reason for 

 this is explained in the text. 



mentioned in the description of the method. This was the first 

 attempt, and as often happens, succeeded better than subsequent 

 attempts. For some reason I was fortunate enough to get the wire 

 into place without introducing strains into the thermo-couples, and 

 the results showed a gratifying regularity. The results of the final 

 run with this second specimen are shown in Figure 9. It is seen that 

 the readings still lie on three different lines, but these lines are now 



