I it will be seen that in three seconds the projectile would have fallen 144 ft.
In a vacuum, the projectile acted on by the force of projection begins to fall under the action of gravity immediately it leaves the bore, and under the combined action of these two forces the path of the projectile is a parabola.
Jacobs Cavern was peculiarly rich in flint knives and projectile points.
In the motion of a projectile under gravity the hodograph is a vertical line described with constant velocity.
Table of Rifling for Stability of an Elongated Projectile, x Calibres long, giving S the Angle of Rifling, and n the Pitch of Rifling in Calibres.