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189 *
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Projeo* 1.1 - Basic Blast Measurements ~ J. J, Messsros
OBJECTIVE
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The objective of Project 1.1 during BM (1000) was to observe the
aifferencea in propagation of the precursor shock over a vegetated surface
and a clear surface.
TESTRON
Five identical gage stations vere placed op each surface at distances
ranging frow 900 feet to 1600 feet from ground sero.
Each station co-
sisted of one self-recording "Q" gage and two self-recorcing pressure-tine
gages.
Alsc, ten experinental rediation-initiated gages vere placed at
various stations.
BESULIS
.
Due to the unexpected high yield of the shot, many of the gages failed
to give significant records.
In all the gages the pressure-sensitive oap-
wules had been subjected to pressures setinated at 200 to 300 percent above
their rated values,
In addition, the high pressures displaced several *Q*
gage nounte and caused considerable chipping of the glass record discs.
Only one of the radiation-initiated gages pave a pressure-tise record.
A pressure-distance plot of the overpressure values obtained by the
pt gegee ie showm in Figure 1.1-1.
There appears to be no significant
difference in the overpressures of the vegetated surface and the clear
surface.
BEST AVAILABLE COPY
13 ge