Mount the mechanism.
On the march the breech and muzzle should always be protected by the covers supplied for the purpose.
When parked, guns and carriages should be covered with paulins.
SIGHTS.
The Front Sight is a plain roughened steel point-sight, and is permanently fixed to the right rim-base.
Fig. 4.
The Bar Tangent Sight ([Fig. 4]) is a plain vertical bar-sight carrying a sliding leaf conveniently graduated. Both the bar and the leaf have clamp-screws to fix them in position. The tangent sight is only mounted on the gun when in action, being at other times removed to avoid injuring it.
The bar is graduated to 15°, each being subdivided into six parts. It may be graduated in yards or metres. It is compensated for natural drift. A vernier-mark on the head of the sight and graduations on the sliding leaf correct ordinary deviations.
The Gunner's Quadrant, for mountain-guns, is a small pocket-quadrant with a spirit-level limb pivoted. On the arc are inscribed both the degrees of elevation and ranges corresponding to the gun for which it is used. It is thoroughly reliable both for direct and curved fire, and to a very great extent supplants the sight-bar.