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Chapter
3
RESULTS
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3-1
SHOT 1
3.1.1
Recovery
PO:
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3
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Py
Of the 32 gages used to instrument Shot 1, all but four were
\gecovered. Station 123.01, the reef station nearest ground zero, was
blownfgut of the coral.
after; the shot.
3.1.2
Neither the gages nor the mounts.were found
a o��
Bog
Records
fo&
AlL yocbrds on Station 122.05, the station nearest ground zero,
were discounted because excessive overpressure caused the pressure cap-
sules to syst| All pressure capsules used at Station 122.06 were
stressed appro
reLy 75 percent above their rated range.
This caused
& permanent sct in the diaphragm, and the stylus did not return to the
zero baseline. Fregsure capsules of the same range were calibrated to
100 percent abov whgir rated range in an attempt to evaluate records
from this station. Fu.tit: obtained by this method may be in error as
much as - 15 percent. . Ti)» records of pressure versus time from the
remaining staticy: <r * +>-- for obtaining positive-phase durations,
because of the:
'
.
..
.
of hash present on the records.
Excessive
hash and high-f: |
‘
‘ ¥eptions present on the records are thought
to be due to turntable wobblé
caused by poor bearings and lack of precision workmanship in the gagd@
assembly.
3.1.3
Presentation of Data ha
“4
The station numbers, distanbés
arrival times, duration of
positive phase, and peak overpresshifes where obtained are listed in
Table 43.1. All pressure readings
‘are ligted, although some readings
are questionable. Brief explanations regarding the reliability of the
reading, type of reading, and Punct ont of the gage have been includ-
ed under the remarks column.
presented in Figure 3.1.
A curve off pressure versus distance is
The points plotted ere.averages of values
from records considered to be reliable.
valuédfor arrival time
versus distance are listed in Table 3.1, but pee not been plotted.
These values may be less than those obtained py-glectronic measure-
ments because of the delay in the fusible link"THitd iion system.
plot has been attempted for the positive phase duratis
No
because of the
scatter and need of a better method of determining the
values.
The values of the peak overpressure have been jr guced to 1 KT
at sea level and plotted in Figure 4.1, along with
reduced values
of succeeding shots and a standard 1.6-KT free-air curve.
24