66 
MESSRS. W. DE LA RUE AND H. W. MULLER OR THE 
tube was connected a deflection of 7°, indicating a total resistance, tube and battery, 
of 3,383,000 olnns =R, 3,383,000 — 230,000 = 3,153,000 = r tlie tube resistance, 
3,153,000 X 11,000 r r\ tt ml in , • ^ 1 P 
- 0 ,, 00 nA -=10,250= V. ine deflection observed was found to be different when 
o,ooo,UUU 
the ring was made positive and negative respectively; the following results were 
obtained in each particular case :— 
Observations July 3rd, 1878.—11,000 cells, short-circuit, deflection 61°, total battery- 
resistance = 230,000 olnns ; deflections afterwards taken with the tube connected, 
the ring being positive. 
Pressure. 
Deflection with 
tube. 
Total resistance. 
Tube-resistance. 
Tube-potential 
V. 
111. 111. 
M. 
ring + 
cells. 
35-5 
46,710 
7-0 
3,383,000 
3,153,000 
10,250 
32-8 
43,158 
4-5 
5,314,000 
5,084,000 
10,520 
31-3 
41,184 
5-0 
4,760,000 
4,530,000 
10,470 
29-2 
38,421 
5-0 
4,760,000 
4,530,000 
10,470 
28-0 
36,842 
6'5 
3,654,000 
3,424,000 
10,300 
26-0 
34,211 
14-0 
1,664,000 
1,434,000 
9479 
25-0 
32,895 
14-0 
1,664,000 
1,434,000 
9479 
23-8 
31,316 
15-5 
1,502,000 
1,272,000 
9340 
217 
28,553 
18-5 
1,242,000 
1,012,000 
8950 
20-8 
27,368 
20-0 
1,141,000 
911,000 
8782 
19-8 
26,053 
2P5 
1,054,000 
824,000 
8592 
187* 
24,605 
21-0 
1,082,000 
852,000 
8660 
17'8[ 
23,026 
23-0 
976,600 
746,600 
8410 
16-0 
21,053 • 
25-0 
890,600 
660,600 
8157 
July 4th.—11,000 cells, short-circuit, deflection 57°, total battery-resistance 
= 263,600 ohms. 
Pressure. 
Deflection with 
tube. 
Total resistance. 
Tub e-resistance. 
Tube-potential 
V. 
m.m. 
M. 
ring + 
cells. 
13-5 
17,763 
26-0 
851,100 
587,500 
7593 
12-1 
15,921 
27-0 
815,100 
551,500 
7446 
107 
14,079 
29-0 
749,200 
485,600 
7129 
9-0+ 
11,842 
38-0 
531,600 
268,000 
5546 
7-9 
10,395 
37-0 
556,200 
292,600 
5788 
6-8 
8947 
43-0 
445,300 
181,700 
4487 
5-3 
6974 
43-0 
445,300 
181,700 
4487 
4'6 
6053 
48-0 
374,000 
110,400 
3247 
* One luminosity like that in Plate 15, fig. 1, Part II. 
t Two luminosities like those in Plate 15, fig. 2, Part II. 
f A phase as 4, fig. 50, Part II., p. 192. 
