interference by natural clouds.
Four of these were on Shot 3, which was fired under such
bad weather conditions that no useful cloud photographs of any sort were taken from the
ground or air.
The data obtained were more complete and accurate than any from previous operations
(see Table 9.1; Ivy data is included for comparison). Good measurements of cloud height
and diameter over a 10-minute interval were compiled by EG&G for the five shots photoTABLE 9.1
CLOUD PARAMETERS
No data were obtained for Castle Shot 3.
Maxiroum
Height
Top at
H+1 min
Diameter at
H+i1 min
Diameter at
8 +10 min
10° tt
10? ft
108 ft
10? &
Castle 1
2
ry
8
8
11¢
110
94
120
12
47
“4
38
44
25
36
33
26
34
19
370
316
125
270
147
Ivy Mike
Ivy King
98
16
39
28
30
ul
200
90
graphed. It was found possible to apply suitable corrections for the effects of earth curvature and atmospheric refraction, for the slight tilt of the camera platform, and for the
altitude of the aircraft. The resulting data agreed quite well from one aircraft to another,
and it was possible to assign smaller uncertainty to the results than had been anticipated.
Unfortunately, it was not possible to evaluate the few data taken later than 10 minutes after
aetonation.
103