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|  MIL-P-48450A(MU)
4.6.4.3.3 Line of sight variation.- Establish coincidence of the
periscope reticle boresight cross and the target (1200 meters)
image crosslines by means of the boresight knobs. While observing the
intersecting point of the reticle boresight cross, rotate the deflection
knob to its clockwise stop. During this rotation of the deflection knob
any variation in elevation in the line of sight through the periscope
reticle boresight cross, shall not exceed the values specified in 3.6.3.1.2c.
Re-establish coincidence of the periscope reticle boresight cross and the
target image crosslines by means of the boresight knobs. While observing
the intersecting point of the periscope reticle boresight cross, rotate the
deflection knob to its counterclockwise stop. During this rotation of the
deflection knob, any variation in elevation in the line of sight through
the periscope reticle boresight cross shall not exceed the value specified
in 3.6.3.1.2c to determine overall conformance with the requirements
specified therein.
4.6.4.4 Image tilt - daylight and passive.- The daylight and
passive optical systems of the periscope shall be inspected utilizing
holder "T" containing telescope "J" with special reticle "L" (Ref. Dwg.
F11738140). The vertical reticle line of the telescope shall be aligned
plumb when in the test position on a qualified level surface. With the aid
of the auxiliary telescope, view through the passive eyepiece of the per-
iscope and establish the telescopes reticle crosslines coincident to the
target (1200 meters) image crosslines. The image of the vertical target
line shall be parallel to the telescope vertical reticle line within the
tolerance specified in 3.6.5, as determined by the tolerance gates provided
on the telescope reticle. Repeat the above procedure with telescope
positioned at the daylight eyepiece of the periscope except, the teles-
copes reticle crosslines shall be established coincident to the infinity
target image crosslines. The vertical reticle line of the infinity target
image shall be parallel to the Telescope vertical reticle line within the
tolerance specified in 3.6.5, as determined by the tolerance gates provided
on the telescope reticle.
4.6.4.5 Parallelism, of reticle and image, passive.- Perform this
test while viewing through the passive eyepiece of the periscope with
the unaided eye. Position one extremity of the periscope horizontal
reticle line coincident to the horizontal target (1200 meters) image line.
The periscope horizontal reticle line shall be parallel to the horizontal
target line within the tolerance specified in 3.6.6, as measured on the
target.
4.6.4.6 Parallelism of target image and projected image.- Perform
this test while viewing through the daylight eyepiece of the periscope
with the unaided eye. Observe the horizontal line of the target (1200
meters) image with respect to the horizontal line of projected infinity
target image. The horizontal lines shall be parallel within the tolerance
specified in 3.6.6.1, as determined by the tolerance gates provided on the
target.
4.6.4.7. Objective focusing range.
4.6.4.7.1 Daylight.- This test shall be performed subsequent to the
test in 4.6.4.2, A dial indicator, graduated in .001 of an inch, mounted
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