1076 
Conclusion. 
The results given for the larger charges are, as they Stand, based on incomplete 
experimental work. 8efore further work in connection with this investigation was abandoned, 
it was planned to use a second drum camera fitted with a telephoto lens to record a row of 
closely spaced lamps covering the first few feet above water level. It was also proposed to 
photograph the plume from the 16—1b. charges with the Marley camera, This procedure would 
have given more accurate time-displacement curves for both the shock wave and the water plume. 
Refercnccs. 
(1) "Measurement of the shock wave velocity in air above a water surface, due to 
the detonation of a submerged charge". 0. Croney and R.D. Davics. 
(2) "Transmission of a shock wave from water to air at normal incidence", 
A.J. Harris. 
(3) "Pressure—time curves for submarine explosions (Second paper)," 
W.G, Penney and H.K. Dasgupta. 
