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MIL-S-45669A(MU)
measure 4.500 inches plus .050 inch and parallelism shall be within
.003 inch per foot.  The surface quality shall be between 32 and 63
micro inches RMS.
4.6.3 Collimation.- This test is accomplished by means of two
plumb lines located approximately fifty feet apart, and the tube of the
device positioned midway between the plumb lines so that the axis of
the tube lies in the plane of the plumb lines. This can be checked by
locating a vertical marker on the center line of the tube at each end.
By means of a collimator, located approximately 15 feet from the back
of the plumb line, bring the two plumb lines and the two markers on the
tube in alinement with the vertical line of the collimator. A peep sight
placed on the objective end of the collimator, with a 3/16 inch aperture
will enable the observer to make an accurate reading. Mount the bore
sight on the tube ,as illustrated in (a) of Figure 1, by means of the
strap assembly. Rotate the bore sight around the outside diameter of
the tube until the cross level bubble is centered, and tighten the clamp
screw. View through the telescope the image of the plumb line. The
vertical line of the telescope shall coincide with the plumb line within
the tolerance indicated in 3.7.1 as read on a mil chart placed in back
of the plumb line. The bore sight is then reversed on the tube, as
illustrated in (c) of Figure 1, and the same cross level and viewing
procedure employed, using the opposite plumb line.
4.6.4 Plumb travel.- Plumb travel check consists of positioning
the bore sight and plumb line as described in 4.6.6. The plumb line as
viewed through the telescope at the intersection of the cross lines of
the reticle shall not deviate more than the tolerance of 3.7.2 when the
telescope is displaced from maximum elevation to maximum depression. A
mil block chart, located at one end of the plumb line, will indicate the
amount of deviation.
4.6.5 Parallelism of reticle and image.- Parallelism of reticle
and image check is made with the bore sight and plumb line positioned
as described in 4.6.6. Locate a mark on a chart in back of the plumb
line which will indicate the horizontal line of sight of the telescope.
Move the telescope to a position where the horizontal line of the reticle
will coincide with the mark. Observe the vertical line of the telescope
in relation to the plumb line which shall be within the tolerance of
3.7.3. A degree chart located in back of the plumb line will indicate
the mount of deviation.
4.6.6 Cross level vial.- Cross level vial check for accuracy con-
sists of mounting the bore sight on the tube of the device by means of
the strap assembly in the position (a) of Figure 1. Locate a plumb-line
precisely eight feet from the center of the pivot shaft of the bore
sight and in a vertical plane with the axis of the tube. By means of
a peep sight with a 1/8 inch aperture placed on the objective end of
the telescope, move the bore sight until the cross mark of the telescope
coincides with the plumb line the full excursion of elevation and de-
pression. In this position, check the cross level vial which shall meet
the requirements of 3.7.4.
-8-

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