MIL-P-45651B(MU)
ings shall meet the requirements specified
shall be manually and visually tested for
in 3.9.8.
backlash. Backlash shall not exceed the tol-
erance specified in 3.9.12.2.
4.5.8.9 Image tilt. This test shall be per-
formed with the aid of an auxiliary tele-
5. PREPARATION FOR DELIVERY
scope. The vertical reticle line of the
5.1 Packaging, packing and marking.
auxiliary telescope shall be adjusted parallel
Packaging, packing and marking shall be in
to the image of the vertical target line. When
accordance with Specification MIL-P-14232
the body assembly is placed in front of the
and Packaging Data Sheet MIL-P-14232/
auxiliary telescope, the image of the vertical
P8289172. The level of protection shall be as
target line shall be parallel to the image of
specified in the procurement document.
the vertical reticle line of the auxiliary tele-
scope within the tolerance specified in 3.9.9.
6. NOTES
6.1 Intended use. The Periscope, Tank:
4.5.8.10 Parallelism of image and reticle.
M31 is primarily intended for use as the
When one extremity of the longest horizontal
gunner's periscope of the primary fire con-
reticle line is coincident to the image of a
trol systems for the 105MM Gun Tanks: M60
horizontal target line, the reticle line shall
and M60A1 and the 90MM Gun Tank:
be parallel to the target line within the
M48A3. The Periscope, Tank: M31C is pri-
tolerance specified in 3.9.10, as measured
marily intended for use in the Combat En-
on the target.
gineers Vehicle: T118E1. Both periscopes
4.5.8.11 Resolution. The resolution test for
have an eight power optical system with
body assembly shall be performed in accord-
reticle for laying the main armament on
ance with 4.5.7.7 to meet the requirements
target and a wide range unity power system
of 3.9.11.
for observation purposes.
4.5.8.12 Eyepiece focus. This test shall be
6.2 Ordering data. Procurement documents
conducted with the aid of a calibrated diop-
should specify the following:
tometer, having a magnification of at least
(a) Title, number, and date of this
three power, adjusted for best focus of the
specification.
dioptometer reticle with the dioptometer
scale set to zero. Adjust the diopter scale
(b) Model of periscope being procured
of the body assembly to zero and position
(M31 or M31C).
the dioptometer at the eyepiece. The reticle
(c) Selection of applicable levels of
of the body assembly shall be in best focus
preservation, packaging, and
within the tolerance specified in 3.9.12 as
packing (see 5.1).
measured on the dioptometer scale.
(d) Applicable packaging data sheet
number (see 5.1).
4.5.8.13 Diopter movement. The diopter
movement of the eyepiece shall be manually
(e) Applicable stock number.
and visually tested for the requirements
6.3 Elevation input coupling. At no time
specified in 3.9.12.1.
shall the elevation input coupling be allowed
4.5.8.14 Backlash. The diopter movement
to strike hard against the travel stop pin.
Custodian:
Preparing activity:
Army--MU
Army--MU
Project No. 1240-A399Y
10
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