ON IMPACT WITH A LIQUID SURFACE. 



Series XIX. 

 Fig. 1. Fig. J. Fig. 3. 



185 



Fig. 4. 



Fig. 5. 



Fig. 6. 



Iii every case there is a quasi-stream-line convergence of flow in the rear of the 

 sphere which was not observable in the rough splash ; this sweeps together the bases 

 of the jets in the crater above the surface, and the entrapping of air seems to depend 

 on the depth to which the sphere has descended when the convergence is completed, 

 and cannot now lie attributed, as in the " rough splash," to the spontaneous segmen- 

 tation of a cylindrical cavity too long to l>e in stable equilibrium. 



It should l>e mentioned that the bubble is liable to detach itself from the sphere, 

 either wholly or in part, before any considerable depth is reached ; thus, in tigs. 2 

 to 6 of Series XIX., careful examination of the photographs with a lens shows that 

 the liquid is l>egmning to pass along the surface of the sphere between it and the air 

 in the manner indicated (with exaggeration) in the accompanying cut (tig. 2). 



Fig. 2. 



VOL. CXCIV. A. 



2 B 



