1896.] Electricity thro Dielectrics traversed by Rontgen Rays. 135 



Experiment 2. (Made on a different day with the same bulb 

 arranged in the same way as in Experiment 1.) 



Distance from centre of the discs to A. Time required to leak 50 divisions. 



5-5 25 



11 5 



16-5 7 



22 1225 



275 15o 



33 25 



38-5 35 



The curves plotted in Fig. 3 show the results of these measure- 

 ments, the ordinates are proportional to the square roots of the 



-10 



10 



20 



30 



40 



Fig. 3. 



times of leak and the abscissae to the distances from 0. We see 

 again that a straight line passing through approximately the same 

 point as before represents fairly well the relation between the 

 distance and the square root of the time required to leak 50 

 divisions. Thus the results obtained by experiments (1), are 

 confirmed by (2). 



Experiment 3. Same arrangement as before. 



Distance of discs from A. Time required to leak 50 divisions. 



6"5 less than 2 

 195 13 



325 32 



52 61 



The results are plotted in Fig. 4, and confirm the conclusion 

 already drawn. In the next (3) experiments, a tube of another 

 pattern was used. This is represented in Fig. 5, A is a flat 

 aluminium plate, B and C aluminium wires fused in the tube. 

 The dimensions of the tube are marked on the figure. The bulb 

 was placed so that D was close to the hole. In Experiment 4, 



