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Five mil click lead mechanism
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Telescope, Panoramic: M137 and M137A1
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External  tritium  contamination



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MIL-T-48554A(AR)
be settable to any reading from 0 to 6399 within + 0.25 mil.
The
3.11.4.4 Correction counter, excursion ranqe. The
correction counters shall have a minimum of 95 mils excursion, but
not over 99 mils excursion, on the "L" and "R" dials.
3.11.4.5 Correction counter setting affect on deflection or
bearing  counter. Setting 95 mils on the "L" counter shall
increase the deflection or bearing counter reading 95 0.5 mils
Setting 95 mils on the "R" counter shall decrease the deflection
or bearing counter reading 95 0.5 mils
3.11.4.6 Correction  counter  setting. There shall be no
change greater than .25 mil in the azimuth counter readings and 0.1
mil maximum movement of the line of sight when the 95 mil values
are set into the correction counters.
3.11.5 Open sight. With the telescope positioned as in 3.7,
the line of sight of the open sight shall be parallel in azimuth
and elevation to the line of sight through the telescope optics
within 10 mils
3.11.6 Torque. The running torque required to operate the
following knobs shall be within the values specified for standard
ambient temperature of +60 to +90F, and shall not exceed the
values specified for extreme operating temperatures. The torque
values for the azimuth knob shall be met with the five mil click
lead knob set for "Indirect" fire (out of detent).
KNOB
At +60F to +90F
At - 50F and +15F
Azimuth
15
in. lbs. max.
3 to 8 in. lbs.
Correction Counter
in. OZS. max.
10 to 20 in. ozs.
40
7 to 80 in. oZS.
10
in. lbs. max.
Boresight Adjustment
in. OZS. max.
Elevation
5 to 40 in. ozs.
80
10
in. lbs. max.
7 to 80 in. oZS.
Clutch Release
3.11.7 Direct  force. The following operability
requirements shall be met with the force applied horizontally and.
in the direction of movement.
3.11.7.1 Elbow  assembly. At a standard ambient temperature
of +60 to 90F, a direct force of 1 to 10 pounds, applied
adjacent to the eye lens, shall be required to rotate the elbow
assembly in each direction through the full extent of travel. The
force required at the extreme operating temperatures of 3.6.2
shall not exceed 15 pounds.
3.11.7.2 Operability. The azimuth counter cover and latch,
head cover and latch, azimuth knob folding handle, elbow detent
lock pin, and the 5 mil click lead shall be operable at the
extreme operating temperatures of 3.6-2.
8

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