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Conr tusions and suggested further work . 



It is concluaeo on the whole that the Ouf)b)e is not -very sensitive to the motion of the 

 target plate, there oeing a ^^li^ht tendency for the OuBole to follow the motion of the target 

 plate, ana for the buDOle not to expand quite as much as it would if the target were rigid. 

 It is intended to determine Dy photography or otherwise the behaviour of the oubPle in two 

 experiments, thi.- conditions of which are identical except that the two target plates are of 

 widely varying strength, the motion of the plates being recorded and correlated with the 

 behaviour of the bubble. 



Acknouil edgement s. 



The theory on which this report is based is due to Mr. H.N.V. Temperley. 



