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|  MIL-P-4845A(MU)
4.6.6.1.4 On-off switch.- This test may be performed at the same
time the test of 4.6.6.1.1 is performed. With the voltage specified in
4.6.6.1.1 applied to Contact 11733497, view through the elbow assembly
eyepiece end observe the Illuminated screen surface of the tube. Then
while the on-off switch is in the on position, remove the voltage from
the contact and reapply. During the above observation, the screen sur-
face of the tube shall shut off when voltage is removed and shall not
Illuminate by reapplication of the voltage unless the on-off switch is
recycled from off to on to be in conforance with 3.8.9.4.
4.6.6.2 Parallax.- View through the daylight eyepiece and establish
coincidence of the periscope reticle boresight cross axial the protected
target image crosslines by means of the boresight knobs. While viewing
through the eyepiece, parallax will be recognized as any apparent dis-
placement of the interacting point of the periscope reticle boresight
cross with respect to the intersecting point of the projected target im-
age crosslilnes when the observer's head is moved from side to side or up
and down. Displacement between-the periscope reticle and target image
shall not exceed the tolerance specified in 3.8.2.
4.6.6.3 Daylight viewing area.
4.6.6.3.1 Elevation knob travel.- Establish coincidence of the peri-
scope reticle boresight cross and the projected target image crosslines
by means of the boresight knobs. While observing the boresight cross
(intersecting point), rotate the elevation knob in the clockwise direction.
The boresight cross shall travel as specified in 3.8.3.1.1a as measured on
the projected target image crosslines by means of the boresight knobs.
While observing the boresight cross, rotate the elevation knob in the
counterclockwise direction. The boresight cross shall travel as specified
in 3.8.3.1.1a as measured on the target.
4.6.6.3.2 Deflection knob travel.- Perform this test utilizing the
procedure in 4.6.6.3.1 except, the deflection knob shall be rotated in
the clockwise and counterclockwise direction. Boresight cross (intersect-
ing point) travel shall meet the requirements specified in 3.8.3.1.1b as
measured on the target.
4.6.6.3.3 Line of Sight variation.- Establish coincidence of the
periscope reticle boresight cross and the projected target image cross-
lines 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 varia-
tion in elevation In the line of sight through the periscope reticle bore-
sight cross, shall not exceed the values specified in 3.8.3.1.1c. 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 ro-
tation of the deflection knob, any variation in elevation in the line of
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