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Page Title:
Figure B-6. Axis of bore and boresights-boresighting. |
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 TM 9-258
through the center of the bore of a gun (fig B-6). The line
gun
is
adjusted
parallel
to
the
axis
of
bore.
of
sight
of
the
sighting
instrument
of
a
Figure B-6. Axis of bore and boresights-boresighting.
Axis of lens - See principal axis.
is due to space between the teeth of the meshing gears.
Balance - See orthophoria.
Azimuth - An angle measured clockwise in a
Balsam - See Canada balsam.
horizontal plane from a known reference point frequently
Base length - In range finders, the actual optical
one of the norths: True North, Magnetic North, or Y-
North (Grid North). (See angle of azimuth). Also used
length of the instrument. It is approximately equal to the
as an adjective to indicate reference to movement in an
distance between the centers of the end windows. It is
horizontal plane as azimuth mechanism or azimuth
the base of the range triangle by means of which the
instrument. To traverse the carriage of a weapon in
range is computed (fig 8-23).
BC periscope (Battery Commander's Periscope) - A
azimuth means to rotate the weapon from side to side in
binocular telescope used for observing artillery fire.
a horizontal plane.
Azimuth instrument - A telescopic instrument used
Beam - With reference to light, a shaft or column of
for measuring horizontal angles.
light; a bundle or rays. It may consist of parallel,
Azimuth mechanism - Any mechanical means
converging, or diverging rays.
Binocular - Pertaining to vision with both eyes. Also,
provided for turning an instrument in azimuth (in
a term applied to instruments consisting of two
horizontal plane). It may contain a worm and wormwheel
telescopes utilizing both eyes of the observer.
to give accurate, smooth movement.
Backlash - A condition wherein a gear, forming part
of a gear train, may be moved without moving the next
succeeding
or
preceding
gear.
It
B-6
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