422 



if- 1' 



Successive spark photographs of an 

 air-filled bubble risin{_^ in nitrobenzene 



Tiine-interval between photographs = 



Velocity of rise of bubble » 



Diameter of steel ball shown in 



upper part of photograph = 



10.3 'nillisecs 

 7.6.7 cm. /sec. 



^ inch. 



