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Deflection knob travel
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Periscope, Tank: M32E1
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Objective focusing range



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MIL-P-48571(MU)
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.l.2b as mea-
sured on the target.
4.6.6.4.3 Line of sight variation.-  Establish coincidence of the peri-
scope 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 eleva-
tion 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 coin-
cidence of the periscope reticle boresight cross and the projected target
image crosslines by means of the boresight knobs. While observing the in-
tersecting point of the periscope reticle boresight cross, rotate the de-
flection 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 speci-
fied in 3.8.3.1.2c to determine overall conformance with requirement therein.
4.6.6.5 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 auxili-
ary telescope, view through the passive eyepiece of the periscope and estab-
lish the telscopes reticle crosslines coincident to the target image cross-
lines. The image of the vertical. target line shall be parallel to the tele-
scope vertical reticle line within the tolerance specified in 3.8.5, as de-
termined by the tolerance gates provided on the telescope reticle.  Repeat
the above procedure with 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.
4.6.6.6 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 image line. The periscope hori-
zontal reticle line shall be parallel to the horizontal target line within
the tolerance specified in 3.8.6, as determined by the tolerance gates pro-
vided on the target.
4.6.6.6.l Parallelism of reticle and image - daylight.- Perform this
test while viewing through the daylight eyepiece of the periscope with the
unaided eye.  Position one extremity of the periscope horizontal reticle
line coincident to the horizontal target image line. The periscope hori-
zontal reticle line shall be parallel to the horizontal target line within
the tolerance specified in 3.8.6.1, as determined by the tolerance gates
provided on the target.
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