1896.] Electricity thro Dielectrics traversed by Rontgen Rays. 129 



Influence of 'pressure on the rate of leak. A series of experi- 

 ments, using the method A, were made to determine the rates of 

 leak through air at different pressures. As the following numbers 

 show, the rate of leak diminishes as the pressure diminishes though 

 the rate of diminution in the rate of leak is not so rapid as that of 

 the pressure. 



Rate of leak through air at different pressures. 



{Pressure}^ 

 x time. 



715 

 758 

 752 

 655 

 600 

 422 



Second set of experiments. 



750 34- 



470 41 



320 51 



170 74 



45 97 



931 



902 

 918 

 962 

 650 



Rate of leak through sulphuretted hydrogen at different 

 pressures. 



771 

 551 

 341 

 101 

 31 

 11 



15 



18-5 

 235 

 48 

 97 

 140 



417 

 454 

 454 

 480 

 533 

 462 



Rate of leak through sulphur dioxide at different pressures. 



611 

 616 

 714 



730 

 528 



