1395 
SUPPORTING ROPES 
MOVABLE CHARGE SUPPORT 
GAUGES WITH CABLES 
RUNNING BACK TO 
RECORDING EQUIPMENT 
Fig. IA 
BOOM USED TO OBSERVE OBLIQUE REFLECTION PHENOMENA 
AT LOW PRESSURES (535 TO 8200 PSI) AT SURFACE POINT, S 
THE GHARGE=TO=BAUGE Pa RONEE MAY BE VARIED FROM 
4 j 
DEPTH INDICATOR WIRE IS ATTACHED DESIRED DISTANCE,0, 
| INCH MARKINGS pi ABOVE CHARGE, AND RING DEPTH IS 
ADJUSTED SO YHAT TAUT WIRE TOUCHES 
THE SURFACE ——- 
SECTION 
Fig 1B 
RING USED IN VERY SHALLOW SHOOTING 
AT SURFACE PRESSURES FROM 6900 TO 
75,900 PSI. DEPTH, D, CAN BE VARIED 
FROM 4IN. TO 12 IN. 
TOP 
FIG, |. 
SCHEMATIC DIAGRAM oF SHOOTING RIGS 
UERL WOODS HOLE, MASS. 
