one sin- erosion was to be kept gle sweep of which unlocks within reasonable bounds, the threads of the breech it was necessary to elim- plug, withdraws the plug, inate the powerful but ero- Weight of powder charge, 59 pounds. Weight of gun, 12.7 tons. and swings it clear of the sive… … less degree the brown pow- Weight of powder charge, 335 pounds. projectile is driven from ders) were ignited almost the muzzle of the gun with instantaneously, and their an energy of over 44,000 whole mass converted into foot-tons, the gun itself is a volume of gas at high driven in the opposite…
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