BRIDGMAN. — MERCURY UNDER PRESSURE. 



393 



tained with the larger of the ahove mentioned capillaries; those of 

 1909 with one of intermediate size. 



The actual data follow. Those for 1909 are in Table VII. and in 

 Figure 15. The data are given in the order in which they were col- 

 lected. The two determinations at the higher pressures after the run 



3 4 5 6 7 8 9 10 



PRESSURE, K6M/CM^XI0"? 



Figure 15. The melting curve of mercury by the change of resistance 

 method. 



with regularly decreasing pressures were made, the one at 9°. 68 to 

 correct the obviously bad point determined first of all, and the one at 

 21°. 4 to make sure that there had been no systematic error introduced 

 after the regular decrease of pressure of the first points. In addition, 

 the three points determined during the initial testing of the apparatus, 

 before the thermostat was installed, are given at the very end. The 

 temperature error here easily accounts for the discrepancies of these 

 last three points. As was stated before, the gauge with which these 

 determinations were made was destroyed before it could be satisfac- 

 torily calibrated. The data used in the reduction of the gauge read- 

 ings were simply the measured dimensions of the gauge, which could 

 not be determined with the requisite accuracy. The column showing 

 the calculated pressure must be taken, therefore, as merely evidence 

 showing the regularity of the results and slight departure from lin- 

 earity, and not as giving accurately the absolute pressures. 



Table VIII. and Figure 15 give the results of 1911. The method by 

 which the results were calculated was the same combination of numeri- 



