1114 
UERL diaphragm gauges, were similarly arranged at two distances aft of 
the charge. A full description of the oypee of instruments used has 
been reported previously in UERL reports. 28) 
4e Rig 
The various gauges were attached to one another and to the charge 
by steel spacer cables which were maintained taut by the drag of the 
sea anchor moving through the water at the extreme aft of the rig. 
When measurements were being made with gauges off either end of the 
charge, the charge was lashed along the steel spacer cable in the correct 
position. Five surface floats were affixed equidistant along the charge 
to maintain its alignment with respect to the gauges. This is shown in 
Fig. 24. When measurements were being made with the gauges off the sides 
of the charge, the charge was lashed with its mid-point at the spacer 
cable to a vertical line running from a surface float to a 55 1b weight 
below the charge. In addition, the charge was bridled at four points 
forward to the spacer cable, as shown in Fig. 2B. 
III. RESULTS 
5. Pressure-Time Curves 
To simplify the further consideration and discussion of this group 
of experiments, the various gauge positions and distances have been 
defined as indicated in Fig. 3. In practice only one of the gauge 
POSITION 
=o 
e 
dx 
POSITION DETONATOR t= x r | Bane 
eB x CHARGE 
— -—©- - ——- ————— - | AXIS 
WAL te sol ia ora 
PERPENDICULAR 
t+— BISECTOR 
FIG. 3 
GAUGE POSITIONS RELATIVE TO LINE GHARGE AND DETONATOR 
positions indicated by Position A, Position B, or Position C was obtained 
from a single shot, three different charges being fired to obtain data for 
all three positions. However, measurements at four different distances 
-L= 
