1198 
= G3 
Vaio 
a ——~ | 
_ \ A iin G4 
| ee a ais ~& ee d is i 
| Ge aaa \- eee ane 
ee D ee 
pl neh 
i} 
t 
= piezo gauge location | 
C= spnericsl Pentolite | 
charge (ca.1700g, ) ; 
| 
| 
| 
| 
& G2 
The Gistance D was varied from zero ( a single charge) 
to 68 inshes, R being kept constent at 4 feet, Tnrcughout thie 
report the separation is expressed in terms of the angle q, 
which is aiso the half angle of shock wave intersection which, in 
the abserce of a Mash effect, would be expected at G-A and G-B, 
Displaced glightly from the plene of intersection were gauges G-4 
(4 inches from G-A) and G-2 (2 inches from G-B), 
To obtain records of the screening effect of the gas bubble 
from one charge on the shock wave from the other charge, gauge 
G-Z was placed along the line of the charges as shown in the 
aketch, 
Simultaneous detonation was obtained by discharging dykancl 
condensers totalling 36 microfarads capacity, charged to ca, 1000 
volts, through the 2 Dupont "SSS" seismograph caps connected in 
serie 
Frior to adoption of the above technique for aimultaneous 
detonation of caps, a more extensive series was run in which peire 
