I. INTRODUCTION 
TI. EXPERIMENTAL METHODS AND EQUIPMENT 
1. 
2. 
Methods of flash photography 
(a) General information 
(b) Water transparency 
(c) Cameras for flash photography 
(4) Argus C-3 
(41) Kodak "35" 
i UERL camera 
iv) Automatic photography 
(ad) Light sources 
(4) Glass enclosed flash charges for depths 
down to 20 feet 
(44) Conical flash charges for depths down to 10 feet 
(4441) Flash charges for depths down to 600 feet 
iv) Other sources 
(e) Underwater equipment 
(f) Firing devices 
Methods of motion picture photography 
(a) Cameras for motion picture photography 
(4) Eastman high speed camera 
ie Jerome camera 
4i1) Victor camera 
(b) Associated equipment for underwater photography 
(4) Underwater gear 
(c) Light sources 
ne Photoflash lamps 
(41) Mercury arc 
(ad) Timers 
(e) Power supply for cameras 
II, RESULTS OF EXPERIMENTS 
a I 
2. 
Cavitation 
(a) Minimum tension necessary to cause cavitation 
(b) Criterion for cavitation in front of steel diaphragm 
(c) Cavitation from objects other than plane surfaces 
{3} Disappearance of cavitation 
e) Cavitation caused by oblique reflection of shock waves 
from air-water interfaces 
Investigation of the effect of shape of charge and point 
of detonation on shock wave and bubble 
iii 
i 
nb NNND DVDR FF fF HF 
15518 
969 
