1896-97.] Apparent and. Real Diselectrification. 399 
insulated terminal of the electrometer inside an aluminium 
cylinder; the space between the metal and the cylinder was 
first filled with air, afterwards with paraffin. The aluminium 
was connected to the case of the electrometer, and inductive 
disturbances were avoided by surrounding the copper wire con- 
necting the metal to the isulated terminal with a lead sheath in 
metallic connection with the electrometer sheath (see diagram 2). 
In our first experiments with this apparatus we had air, instead 
of the main mass of paraffin, separating the insulated metal from 
the surrounding aluminium tube, as shown in the diagram, and we 
had only small discs of paraffin serving as insulating supports for 
the ends of the metal, and not played on by the Rontgen rays. 
When the metal thus supported was charged, whether positively 
or negatively, the Rontgen rays diselectrified it in about five 
seconds; not, however, to the metallic zero of the electrometer, 
hut to a “ rays-zero ” depending on the nature of the insulated 
metal surrounding it. 
With paraffin between the aluminium cylinder and the insulated 
metal within, as shown in the diagram, the following results were 
obtained : — 
December 30, 1896. 5.30 p.m. — Interior metal charged negatively. Total 
charge, 356. 
Rontgen lamp in action and no screen, 39 scale divisions discharged in 5 mins. 
R. L. not acting, . . . .25 ,, ,, 5 ,, 
R. L. again acting and no screen, . 17 ,, ,, 5 ,, 
5.45. — Interior metal charged positively. Total charge, 244. 
R. L. in action and lead screen, . 1 scale division discharged in 3 mins. 
R. L. in action and no screen, .6 ,, ,, 3 ,, 
R. L. not acting, .... 0 ,, ,, 3 ,, 
Dec. 31, 1896. 10.54 a.m. 
charge, 163. 
R. L. not acting, . 
R. L. acting and no screen, . 
11.0 — R. L. stopped, . 
R. L. again acting, no screen, 
R. L. stopped, 
— Interior metal charged positively. Total 
. 2 scale divisions discharged in 3 mins. 
• 
1 
33 
33 
. 
1-5 
33 
3 3 
. 
CO 
3 3 
33 
. 
2*5 
3 3 
33 
3 
2 
2 
3 
3 3 
3 3 
33 
33 
11.12. — Interior metal charged negatively. Total charge, 342. 
R. L. not acting, . . . .10 scale divisions discharged in 3 mins. 
R. L. acting, no screen, . 21 ,, ,, 3 
11.18 — R. L. stopped, . .11*5 ,, ,, 3 
R, L. acting, no screen, ... 16 ’5 ,, 3 
33 
33 
33 
33 
