1362 
16. 
17. 
18. 
A. M. Shanes: "Measurements on Pressure Waves in Region 
of Two Obliquely Intersecting Underwater Shock Waves" = 
Underwater Explosives and Explosions No. 21, p. 52 = 65, 
Divigion S, NDRC, Interim Report (1944). 
R. W. Spitzer and R. S. Price: "Photographs of Intersecting 
Shock Waves (Mach Effect)" =- Underwater Explosives and Ex- 
plosions No. 16, p. 26 = 29, Division 8, NDKC, Interim 
Report (1943). 
J. E. Eldrige: "Increased Damage to Diaphragm Gauges in 
the Mach Region Underwater Explosives and Explosions No. 
18, pe 68 - 69, Division 8, NDRC, Interim Report (1944). 
T. Zandstra and V. Kumin: "Mach Effect Underwater, Effect 
of Intersecting Shock Waves on Cylindrical Shell Target" - 
Underwater Explosives and Explosions No. 19, p. 21 = 24, 
Division 8, NDRC, Interim Report (1944). 
E,C. Campbell, and C.W, Wyckoff of the David Taylor 
Model Basin have similarly taken photographs a) of two 
Simultaneously detonated Hercules caps as sources of shock 
waves. The collision shown in fig, 21, Plate II, is cer- 
tainly "regular", whereas that in fig, 22 is probably Mach, 
(the optical effects are not completely understood), 
= 
