Gun laying means moving the axis of the bore of the barrel in two planes, horizontal and vertical.
2.
This was a piece of metal placed on the muzzle to make the line of sight parallel to the axis of the bore.
3.
These could be separate instruments placed on a surface parallel to the axis of the bore or physically integrated into some form of sight mount.
4.
This computed a correction for the cross level of the gun and used feedback from electronic clinometers, aligned to the axis of the bore.
5.
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.
6.
By the late 19th century the simple open tangent sights were being replaced by optical telescopes on mounts with an elevation scale and screw aligned to the axis of the bore.
7.
A notable change is the use of a more conventional lower sight line closer to the axis of the bore, in contrast to the elevated sights of the AR-15.
8.
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.
9.
The walls of the bassoon are thicker at various points along the bore; here, the tone holes are drilled at an angle to the axis of the bore, which reduces the distance between the holes on the exterior.
10.
2nd Armored Cavalry Regiment soldier, assisting in the critical job of " boresighting " the alignment of all the tank's sights to the center of the axis of the bore of the main gun on an M1A1 Abrams in Mosul, Iraq in January 2005.
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