igher, or lower, until the line of aim is established when he
commands, "Mark," or "Hold."

At the command "Mark," being careful not to move the disk, the marker
records through the hole in the center the position of the disk and
then withdraws it.

At the command "Hold," the marker holds the disk carefully in place
without marking, until the position is verified by the instructor, and
the disk is not withdrawn until so directed.

=1357. Point of Aim.= Always be sure to aim at a point just below the
black bull's-eye,--that is, aim so that there will be a fine line of
light between the bottom of the bull's-eye and the-top of the front
sight (Fig. 19). This is important to insure uniformity in
sighting,--that is, in order to make sure that you aim at the same
place on the target each time. If the top of the front sight touches
the bottom of the bull's-eye it is impossible to say just how much of
the front sight is seen, and how far up into the bull's-eye you are.

[Illustration: Fig. 19]

First Sighting Exercise

=1358.= Using the sighting rest for the rifle (Fig. 17) require each
man to direct the marker to move the disk until the rifle is directed
on the bull's-eye with the _normal_ sight and command, "Hold." If
aiming correctly the rear sight, the front sight and the bull's-eye
will look as shown in Fig. 19, above.

The instructor then verifies this line of sight. Errors, if any, will
be pointed out to the soldier and another trial made. If he is still
unable to sight correctly, he will be given as many more trials as may
be necessary.

Sometimes a man does not know how to place the eye in the line of
sight; he will look over or along one side of the notch of the rear
sight and believe that he is aiming through the notch because he sees
it at the same time that he does the front sight. Again some men in
sighting will look at the front sight and not at the object.

Repeat the above exercise, using the _peep_ sight. If aiming
correctly, the rear sight, the front sight and the bull's-eye will
look as shown in Fig. 20.

[Illustration: Fig. 20]

Second Sighting Exercise

=1359. The triangle of sighting.= Using the sighting rest for the
rifle as before (Fig. 17), direct the marker to move the disk until
the rifle is directed on the bull's-eye with the _normal_ sight and
command "Mark," whereupon the marker, being careful not to move the
disk, records through the hole in its center, the position of the
di