"Lands. The four raised spaces in the bore of the rifle between the
grooves. These lands grip the bullet as it passes through the bore and
rotate it to the right about the longer axis. This rotation serves to
prevent tumbling and keeps the bullet accurately on its course. This
spinning of the bullet also causes it to drift slightly to the right as
it passes through the air. The same effect is produced by throwing a
baseball with a twist.
"Twist. The spiral formed by the grooves in the barrel of the piece.
The twist is uniform and to the right, one turn in ten inches.
"Length. The rifle without bayonet is 43.212 inches long. With bayonet
it is 59.212 inches long.
"Manufacture. The United States Rifle is manufactured by the
Government at Springfield Armory, Massachusetts, and Rock Island
Arsenal, Illinois.
"Rear Sight Leaf. Graduated from 100 to 2850 yards. The odd range is
on the right branch of the leaf, the even on the left. Note that the
line corresponding to a range is below a numeral.
"Battle sight is the position of the rear sight in which the leaf is
laid down.
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