BRIDGMAN. — MERCURY UNDER PRESSURE. 



391 



vice ; a stream of ice water, or for the lower temperatures a stream of 

 CaCU brine, running constantly into the bath, which was automatically 



TABLE VII. 



Freezing Pressure at Different Temperatures by the Method of 

 Ch.ange of Electrical Resistance. Data of 1909. 



heated with a Simplex heating coil when the temperature fell too low. 

 The temperature did not vary more than 0°.01 during a run, whereas 

 a change of 0°.05 is necessary to produce a change in the equilibrium 

 pressure of 10 kgm. which was about the limit of accuracy of the gauge. 

 The temperature range of the experiment was from —15° to +20°. 

 Since the freezing curve as determined between +20° and —15° extra- 



