[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.
Fig. 20
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].
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 disk, 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.