10 



The following Table contains a similar summary of the results 

 upon cylindrical vessels : 



The paper includes an investigation of the laws of collapse as 

 exhibited in these results, and the following general formulae are 

 obtained : 



For glass globes P= 28,300,000 x ~ 



7 1*4 



For glass cylinders P= 740,000 x , 



where P = the collapsing pressure in pounds per square inch ; 

 k = thickness in inches ; D and L = diameter and length re- 

 spectively in inches. 



* These globes remained unbroken. 

 t Remained unbroken. 



