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|  MIL-P-48619(AR)
specified in 3.8.3.1.2a as measured on the target. Re-establish
coincidence of the reticle boresight cross and the projected target
image crosslines by means of the boresight knobs. While observing
the boresight cross, rotate the elevation knob in the counter-
clockwise direction. The boresight cross shall travel as specified
in 3.8.3.1.2a, as measured on the target.
4.6.6.4.2 Deflection knob travel. -Perform this test utilizing
the procedure in 4.6.4.4.1, except the deflection knob shall be
rotated in the clockwise and counterclockwise direction. Boresight
cross (intersecting point) travel shall meet the requirements
specified in 3.8.3.1.2b as measured on the target.
4.6.6.4.3 Line of siqht variation. -Establish coincidence of the
periscope reticle boresight cross and the projected target 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, a variation in elevation in the line of sight
through the periscope reticle boresight cross, shall not exceed the
values specified in 3.8.3.1.2c. Re-establish coincidence of the
periscope reticle boresight cross and the projected 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 values specified in 3.8.3.1.2c to determine overall
conformance with the requirements specified therein.
4.6.6.5 Image tilt - dayliqht and passive. -The daylight and
passive optical systems of the periscope shall be inspected utiliz-
ing holder "T" containing telescope "J" with special reticle "L"
(Ref. Dwg 11738140). 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 periscope and establish the
telescopes reticle crosslines coincident to the target image cross-
lines. The image of the vertical target line shall be parallel to
the telescope vertical reticle line within the tolerance specified
in 3.8.5, as determined by the tolerance gates provided on the
telescope reticle. Repeat the above procedure with the telescope
positioned at the daylight eyepiece of the periscope. The images
formed by the two optical systems (daylight and passive) of the
periscope shall meet the requirements specified in 3.8.5.
30
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