490 Prof. W. A. Osborne and Mr. W. Sutherland. [July 5, 



500 1 1 1 -1 1 — — I 



O 12 3 4 5 



Radius in centimetres. 

 Fig. 3. 



I may mention in this connection that if inflation be carried out 

 immediately after deflation the rise of pressure does not follow the same 

 gradient as the deflation fall. It is much steeper, and a crest may be 

 obtained. An illustrative specimen is the following (fig. 4) : — 



It is easy to demonstrate, however, that the more a balloon is inflated and 



zoo 



6150 



.E100 



a. 50 



I 2 3 4 S 



Radius in centimetres. 



Fig. 4. 



