Anyone that has handled a LP.08 (Artillery) has probably noticed that as the rear sight is raised, it moves to the left. It never knew the reason for this sight displacement until I was reading about the 1903 Springfield rifle, and it told about the rear sight moving to the left as the sight slide was raised. Turns out that physics has a hand in it, and as the bullet starts to nose over, air pressure under the nose of the bullet wants to push the bullet back up. When this happens the bullet starts to drift in the direction of it's rotation. Since the bullet starts this slow curve, the sight is moved in the opposite direction to compensate for this drift.
On the LP.08 the sight pin is drilled eccentric as can be seen in the photographs, and the front of the sight base and the sight are cut at an angle so that when the sight is raised, it moves left.
On the LP.08 the sight pin is drilled eccentric as can be seen in the photographs, and the front of the sight base and the sight are cut at an angle so that when the sight is raised, it moves left.
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