BRIDGMAN. — A SECONDARY MERCURY RESISTANCE GAUGE. 247 



35 



80 



35 



1000 



2000 



3000 



4000 



5000 



6000 



7000) 



Figure 8. Various functions of the specific resistance of mercury plotted 



1 ARs _ 1 dR s , „ dR s , „ . .. 

 against pressure. 1 shows -5- , 2, ^- -=— , and 3, -=— , where R is the 



initial resistance and R s is the variable resistance under pressure, corrected 

 for the distortion of the glass containing vessel. 



1 A /? 



at lower pressures. According to the results above, ■= £ varies from 



3.344 to 3.031 X 10 - 5 between and 2000 kgm., giving a mean value 

 of 3.187 X 10~ 5 , which agrees within 1.1 per cent with de Forest 



TABLE VIII. 



Specific Volume Resistance and Specific Mass Resistance of 

 Mercury under Pressure. 



