sk, and withdraws it. Then, being careful not to move the rifle or
sights repeat the operation until three marks have been made.

Join the three points by straight lines. The shape and size of the
triangle will indicate the nature of the variations made in sighting.

[Illustration: Fig. 21]

For example, if you have taken the same aim each time, you will get a
very small triangle something like this: [Illustration: triangle]
which resulted from taking each time this aim, for instance:

[Illustration: Fig. 22]

A triangle like Fig. 22 results from not taking the same amount of
front sight each time, as shown in Fig. 23.

[Illustration: Fig. 23]

[Illustration: Fig. 24]

A triangle like Fig. 24 shows that the front sight was not in the
middle of the notch each time, as shown in Fig. 25.

[Illustration: Fig. 25]

A triangle like Fig. 26 results from a combination of the two errors
mentioned above,--that is, not taking the same amount of front sight
each time and not having the front sight in the middle of the notch
each time, as shown in Fig. 27.

[Illustration: Fig. 26]

[Illustration: Fig. 27]

If any one of the sides of the triangle is longer than one-half inch,
the exercise is repeated, each sight being verified by the instructor,
who will call the soldier's attention to his errors, if any.

The smaller the triangle, the better the sighting.

=1360. Verifying the triangle.= If the sides of the triangle are so
small that they indicate regularity in sighting, mark the center of
the triangle and then place the center of the bull's-eye on this mark.
The instructor then examines the position of the bull's-eye with
reference to the line of sight. If the bull's-eye is properly placed
with reference to the line of sight, the soldier aims correctly and
with uniformity.

If the bull's-eye is not properly placed with reference to the line of
sight, the soldier aims in a regular manner but with a constant error.

=1361. Causes of errors.= If the bull's-eye is directly above its
proper position, the soldier has aimed high,--that is, he has taken
too little front sight.

If the bull's-eye is directly below its proper position, the soldier
has aimed low,--that is, he has taken too much front sight.

If the bull's-eye is directly to the right or left of its proper
position, the soldier has not sighted through the center of the rear
notch and over the top of the front sight. If to the _right_, the
soldier has e