Popular Science Monthly 



501 



the picture. These guns are intended to be used at the two ends of the Panama Canal 



will be lengthened so that the powder charf^Ls inay exert a longer push on the projectile. 

 It is claimed that this expedient will make our fourteen-inch gun of the future even more 

 powerful than the fifteen-inch gun of the Queen Elizabeth, which at present is unequaled 



