ming or sighting a rifle consists in bringing into line three
objects: _The target_, A, _the front sight_, B, and _the rear sight_,
C.

[Illustration: Fig. 3]

The rifle is so made and the sights placed on it in such a way that
when the piece is held in such a position that the _target_, the
_front sight_ and the _rear sight_ are in line, and the trigger is
pulled (squeezed) the bullet will strike the _target_.

You raise the muzzle of the piece by raising the rear sight,--that is,
raising the rear sight has the effect of raising the muzzle, for the
higher you raise the rear sight the higher must you raise the muzzle
in order to see the front sight and get it in line with the object
aimed at and the rear sight.

This is shown in the following illustrations:

[Illustration: Fig. 4]

[Illustration: Fig. 4a]

The rear sight, C, the front sight, B, and the bull's eye, A, are all
on a line with the eye, D, the rear sight being set for 200 yards.

Suppose we wanted to shoot at 2000 instead of 200 yards. We would
raise the slide up to 20 (2000 yards) on the sight leaf.

In order to see the bull's eye through the notch sight at 2000, we
must raise the eye to the position, D. We now have the rear sight, the
bull's eye and the eye in line, but we must bring the front sight in
line with them, which is done by raising the muzzle of the piece,
giving the result shown in Fig. 4a.

=1351. Line of sight.= With the open sight the line of sight is
determined by a point on the middle line of the notch of the rear
sight and the top of the front sight.

With the peep sight, the line of sight is determined by the _center_
of the peep and the top of the front sight.

Kinds of sights

=1352.= (See Fig. 3, par. 1343, giving rear sight leaf in detail.)

The different kinds of sights are as follows:

(a) =Open sight.= By _open sight_ is meant the use of any one of the
_sighting notches_.

To use the open sight:

1. Look through the sighting notch at the target. (Fig. 5.)

[Illustration: Fig. 5]

[Illustration: Fig. 6]

2. Bring the top of the front sight _on a line with the top and in the
center_ of the sight notch, _the top of the front sight being just
under the bull's eye_.

Because of its wide field of view and its readiness in getting a quick
aim with it, the open sight is the one that is generally used in the
later stages of battle, or when fire is to start immediately.

(b) =Peep Sight.= By _peep sight_ is m