102 



BRIDGMAN. 



TABLE IX. 



Relative Specific Resistance of Liquid Mercury. 



specific resistance, that is, they are the relative values of the resistance 

 which would be shown by a body of mercury of invariable dimensions, 

 but with the total mass changing with pressure and temperature. 



Certain differences between the new and the old results should be 

 mentioned. At 25° the change of resistance under ()500 kg. is now 

 found to be 0.1586, against the old value 0.1562. The previous 

 formula given for the resistance up to 6500 kg. gives rather good results 

 when used for extrapolation to 12000 kg. At 25° the observed decre- 

 ment of resistance is now found to be 0.2622 against the ^'alue 0.2600 

 computed by the formula previously given. The dift'erence is approxi- 

 mately the same as that between the previous and the present observed 

 values at 6500 kg. Over the narrower temperature range of the 

 previous work the effect of temperature was taken as linear at any 

 constant pressure. Over the greater temperature range of the 

 present work, this is found not to hold, but the eff'ect of temperature 

 becomes greater at the higher temperatures, and passes through a 

 minimum near 25°. x\t atmospheric pressure, however, the relation 

 between resistance and temperature is still found to be linear within 

 the limits of error, which are about 5/10,000 of the total resistance. 



The resistance of the solid under pressure was measured by filling 



