-5- 465 



Rcsul ts. 



Topical photographs from a high speed cine record are given in Figure 5. These show 

 the water phenomena associated with the detonation of smill ch:irges Celow the witer Surface, 

 In each c-ise the lower portion of the picture shows the buDDle formed in the water by the 

 products of the explosion. The upper portion shows the formation of the surface phenomena 

 typical of an underwitur cxplosioni 



AcKnoioLed^cmcnts . 



The writers wish to thank Mr. 0,R. Leah, B.Sc, A.M.I.E.E., for his assistance with the 

 design of the control circuit, Messrs. w.L. Millar ana F, winfield for their work during the 

 development of the technique. 



References , 



(1) Lester, H.M, G.E. Review, «7 (April, i9UU) 



(Z) Palme, A. American Photography (January, i9U5) 



(3) Lester, H.M, j. Soc. Mot. Pict.Engrs.US, (November, 19U5), 



