414 ^IR. C. T. R. WILSON OX THE COXDEXSATIOX NUCLEI PRODUCED IN 
Distance of Spark from Quartz Plate =11 centims. 
p = gauge reading 
(approx. = pressure fall). 
Duration of 
exposure. 
Interval after 
exposure. 
1 
1 
Result of expansion. | 
(10) 101 millims. 
30 secs. 
0 
Dense fog 
(11) II „ 
30 „ 
0 
Slight shower 
(12) 74 „ 
3 mins. 
0 
Slight shower 
(13) 134 „ 
30 secs. 
0 
Fog 
(14) 68 „ 
30 „ 
0 
Slight shower 
(15) 38 „ 
5 mins. 
0 
Few drops 
(16) 140 „ 
5 secs. 
0 
0 
(17) 140 „ 
20 „ 
0 
Fog 
(18) 140 „ 
•5 „ 
1 sec. (approx.) 
1 drop seen 
(19) 140 „ 
10 
Shower 
(20) 140 „ 
20 „ 
?? 
Very dense shower 
(21) 140 „ 
1 min. 
Fog : 
(22) 163 
Current switched on 
momentarily. 
Shower ' 
1 
Distance of Spark from Quartz Plate = 5’5 centims. 
p/ = gauge reading 
(approx. = jjressure fall). 
Duration of 
exposure. 
Interval after 
exposure. 
Result of expansion. 
(23) 
85 millims. 
10 secs. 
0 
Shower 
(24) 
85 
5 „ 
0 
0 
(25) 
85 
„ 
10 „ 
0 
Shower 
(26) 
85 
15 „ 
about 1 sec. 
Fog 
(27) 
41 
30 ,, 
77 
Shower 
(28) 
41 
20 „ 
77 
0 
(29) 
41 
75 
40 ,, 
77 
Fog 
Distance of Spark from Quartz Plate = 32 centims. 
p = gauge reading 
(approx. = pressime fall). 
Duration of 
exposure. 
Interval after 
exposirre. 
Residt of expansion. 
i 
(30) 
156 millims. 
20 secs. 
0 
Shower 
(31) 
140 
57 
2 mins. 
0 
0 
(32) 
169 
5 secs. 
0 
Fog 
(33) 
169 
77 
3 „ 
about 1 sec. 
Dense shower 
(34) 
153 
7? 
10 „ 
0 
1 or 2 drops 
(35) 
185 
77 
20 „ 
10 secs. 
Fog 
(36) 
185 
77 
20 „ 
20 „ 
Verj^ dense shower 
(37) 
185 
77 
20 „ 
30 „ 
Slight shower 
