L891.] Tubes and Balloons distended by Fluid Pressure. 461 



The results are given in Diagram II. 



Diagram III gives the values of the function (KI)/K^K in terms 



*:. 



In Diagram I the abscissa is rfr . 



(a) shows the observed pressure iu the tube. 

 (6) extension of 



' > represent the values of < . 



(d) j IP 



(e) is the theoretical pressure. 

 (/) extension. 



After the unstable state is reached the formula for the extension does 

 apply. For this tube t /r 0'039. 



