MIL-S-3475
spected for conformance with this specifica-
the zero graduation on the elevation microm-
tion and as specified in 51-7
eter shall be opposite its index.
and 61-70-2.
3.3.2 Collimator.-The line of sight of the
collimator shall be parallel with the flat back
4.2 Tests.
surface of the dovetail with + 3 mils.
4.2.1 ACCUracy test.--Each sight shall be
3.3.3 Open sight.--The line of sight of the
tested for accuracy of elevation at not less
open sight shall be parallel with the line of
than six different settings between 40 and
sight of the collimate within + 5 mils.
90 degrees and for accuracy of deflection at
3.3.4 Plumb travel.
not less than eight settings throughout the
deflection movement.
3.3.4.1 The line of sight of the collimator
shall not deviate from a plumb line by more
4.2.2 Temperature test.--The temperature
than 1.75 mils, when rotated from 40 to 90
test specified in Specification 51-7 for type
degrees by means of the elevation knob.
III instruments shall apply.
3.3.4.2 The line of sight of the collimator
shall not deviate from a plumb line by more
5. PREPARATION FOR DELIVERY
than 3 roils when the collimator assembly is
rotated throughout its limits of motion about
5.1 Packaging, packing and marking shall
the pivoting axis.
be in accordance with approved specifications
furnished by the procuring agency.
3.3.5 The error in any elevation setting
between 40 and 90 degrees shall not exceed
10 minutes.
6. NOTES
3.3.6 The error in any deflection setting
.
6.1 Ordering data. -- Procurement docu-
shall not exceed 3 mils.
ments should specify the following:
3.3.7 Backlash.-Backlash in the elevation
a. Title, number, and date of this speci-
mechanism shall not exceed 5 minutes and in
fication.
the deflection mechanism it shall-not exceed
1 mils.
b. Whether domestic or overseas pack-
aging is required (see 5.1).
3.3.8 Vertical displacement of the line of
sight due to reversing the azimuth move-
Notice. --This specification, together with speci-
ment by means of the azimuth knob shall not
fications and drawings pertaining to it and bearing a
exceed 0.5 mil.
"NOTICE" of similar restrictions, is intended for
use only in connection with procumbent by the
3.4 Temperature. -- The temperature re-
United States Government; and shall not be repro-
quirements specified in Specification 51-7 for
duced either wholly or in part except when author-
type III instruments shall apply.
ized in connection with Government procurement,
nor be used for any other purpose except when
3.5 Workmanship. -- Workmanship shall
specifically y authorized by the Chief of Ordnance.
be in accordance with Specification 51-7.
4. SAMPLING, INSPECTION, AND TEST
Custodian:
PROCEDURES
Army-Ordnance Corps
Other interest:
4.1 Inspection. -- Unless otherwise speci-
Navy-O.
fied, each sight and spare part shall be in-
2
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