502 
MESSRS. W. DE LA RUE AND H. W. MULLER ON THE 
The following’ results were obtained with tube 359 air:— 
Pressure 0’5 millimetre. Battery 1200 cells. 
Arrangement II. Stout wire. 
Potential, cells. 
Pressure 0'18 millimetre. Battery 1200 cells. 
Arrangement II. Stout wire. 
Potential, cells. 
Tube. 
No. 3. 
No. 2. 
No. 1. 
Ring. 
Tube. 
No. 3. 
No. 2. 
No. 1. 
Ring. 
540 
10 + 
40 + 
0 
0 
730 
20 + 
50- 
70- 
0 
Pressure 0 - 0335 millimetre. Battery 2400 cells. 
Arrangement II. Stout wire. 
Potential, cells. 
Tube. 
No. 3. 
496 
273- 
No. 2. 
273- 
No. 1. 
273- 
Ring 
Pressure 0’01 millimetre. Battery 5840 cells. 
Arrangement II. Stout wire. 
Potential, cells. 
Tube. 
No. 3. 
4627 
912- 
No. 2. 
1068- 
No. 1. 
Ring. 
912- 
0 
So that in the vicinity of the negative, which was well connected to earth and gave 
no deflection, there was at pressure 0T8 the remarkable phenomenon of a develop¬ 
ment of a negative charge on the idle wire No. 2 of a potential equal to 50 cells, and 
on No. 1 of 70; this negative development increased up to a potential of as high as 
1068 cells, at a pressure of 0‘01 m.m. These results are shown in the curve (fig. 25). 
Fig. 25. 
