THE reaction of a burning powder charge in a firearm is of course equal and opposite to that of action of the projectile propelled; owing however to the greater mass and inertia of the gun and its consequent relative slow velocity in recoil, this is not generally appreciated.
The effect of the recoil shock is felt in the same manner, and is under the same law as the blow of the projectile is delivered; one-half mass times the square of the velocity.
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