Q. What is the angle of departure?
A. The angle included between the line of departure and the horizontal plane.
Q. Define drift.
A. It is the deviation due to the rifling in the gun to the right or left of the vertical plane passing through the axis of the bore, or plane of fire. It is always to the right in the U. S. service.
Q. To what in a telescopic sight does the front sight on an open sight correspond?
A. The intersection of the cross-hairs.
Q. To what does the rear sight correspond?
A. The eye-lens.
Q. What is the trajectory?
A. The path of the projectile in the air.