421 



- 7 - 



pulsation has died aw^y, is jf the ssme order as that prtdictcd from measurements with BubDUs whose 

 volumes are cf oraer one terv-mi 11 i. nth tc cne millionth ^f that : f the explosion products. 



Though the .vork here discussed is concerned with single buLibles, it may be remarked that if th( 

 gas separates into two bubbles, the velocity of each would only be reduced by i2i per cent if the 

 Bubbles rose inoependently, if it separates into 64 i.qu.al Bubbles and each rises independently, the 

 rate of rise would be reduced by 50 per cent, but if they co-operate so that each bubble moves in a 

 risin;j current produced By the others, the rate of rise will not be reduced so much. 



