cannon-ball, of which the Hon.

J.T.Maston spoke the day before yesterday, is driven out of the cannon by 16 lbs.

of powder only." "You are certain of your figures ?" asked Barbicane.
"Absolutely certain," answered the major.

"The Armstrong cannon only uses 75 lbs.

of powder for a projectile of 800 lbs., and the Rodman Columbiad only expends 160 lbs.