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This means that the rifle sight setting for any range from 0 to 500 meters is available. The sight adjustment procedure can be followed step-by-step. 1. Determine the slant range to the target. Assume that a range finder is available that determines that the target is exactly 300 meters distance. 2. Determine the elevation angle of the target.
Because when using a telescopic sight, the crosshair lines geometrically resemble the X- and Y-axis of the Cartesian coordinate system where the reticle center is analogous to the origin point (i.e. coordinate [0,0]), the designated sighting-in point is known as a zero, and the act of sighting-in is therefore also called zeroing.
The coordinate system has the target as its origin. The y axis value range to the target. US Navy rangekeepers during World War II used a moving coordinate system based on the line of sight (LOS) between the ship firing its gun (known as the "own ship") and the target (known as the "target"). As is shown in Figure 1, the rangekeeper defines the ...
US Marines with a 106 mm M40 recoilless rifle, during the Battle of Huế. A spotting rifle or ranging gun is a small-calibre rifle used as a ranging device for artillery.The ballistics of the spotting rifle are matched to those of the artillery piece, [1] so that if a shot from the spotting rifle lands on the target, it may be assumed that the main weapon will also do so.
Most range finders fall in the 20- to 25-millimeter range. For comparison, most binoculars have 40- to 50-millimeter objective lenses and spotting scopes will be 50- to 100-millimeters.
Either the sight was in fixed alignment with the axis of the bore with ranges marked in the sight, and the gunner laid the range mark on the target. Or during laying the gunner physically set the range to offset the axis of the bore from the axis of the sight by the correct amount and laid using the centre mark in the sight.
On the other hand, a firearm with a short bore-to-sight distance will need less sight adjustment when changing between targets at close ranges. At longer ranges the bore-to-sight distance will be of less importance, since gravity has affected the projectile so much that the height difference between the bore axis and the sight axis has far less ...
Coincidence rangefinders were important elements of fire control systems for long-range naval guns and land-based coastal artillery circa 1890–1960. They were also used in rangefinder cameras . A stereoscopic rangefinder looks similar, but has two eyepieces and uses a different principle, based on binocular vision .