Handbook of Ballistics, Vol. 1: Exterior Ballistics; Being a Theoretical Examination of the Motion of the Projectile From the Muzzle to the Target (Classic Reprint);

Excerpt from Handbook of Ballistics, Vol. 1: Exterior Ballistics; Being a Theoretical Examination of the Motion of the Projectile From the Muzzle to the Target

§1. The resistance of the air will be neglected in our preliminary investigation. Let the origin 0 be taken as the centre of the muzzle of the gun and the velocity of the shell at the point 0 be and let its direction make an angle ϕ with the horizon; ϕ is called the "angle of departure"; the vertical plane through the initial tangent is called the "plane of fire."

This plane of fire through 0 is taken as the plane of the coordinate axes; and the axes of x and y are the horizontal and vertical lines through 0 in this plane.

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