54 



ON THE CONSTRUCTION OF HOOPED CANNON. 



Fig. 4. Wire from ?ame hank after it had been fully annealed 





40 60 80 100 



120 



lines continued. 



300 



With this iofl wins the permanent stretch commences at 100 pound- 



inch section ; 

 of the length 



Wire broke, 320 



14,648 pounds strain per square 



and the permanent elasticity left afW if*;* •*« • • . -* 



, rt . ' Ut attCr ,hl * rtrain «■ only ^ths of an inch, or ^W h part 



of the wire. 



