Publications and instruction
RESTRICTED
REFERENCE
PUBLICA-
TIONS
LOW ALT!-
TUDE AT-
TACHMENT
See Field
Mainten-
ance And
Calibrat-
ion
N.O.P. 7849 - 8181
N.O.P. ·649 - Operation of the M4. 5. 8 and ?
s:chts.
Students should become
eclaired with the materia!
•. 0. P.
*393 -
wa rance of the M4. 5. 629c
sights. Additional points con-
c:ming maintenance will befcine
i- this camphiet.
=:39
9540
Corat on of the
M3 sigh:.
Mai tenance of the M3 si: -:.
C :
..R el letters of instruction should also
0: 331020
at
this time,
so that
the student may
acquainted with information relating to
changes
and
additional information not contained
in N.O.P.s.
A. Nomenclature.
1.
Compass card.
2. Wind gear.
3. Adjustable scale (ballistic coefficient of
the bomb).
4. Upper
knob locks the compass card to the
plate.
5. Lower knob locks the wind gear to the com-
pass card.
5. Drift bar.
7. Scale on the
right of the drift bar is
s. Scale on the
the left of the drift bar is the
adjustable scale.
÷. Drift
pointer
is at the lower end of the
drift bar.
•. Underbar is the true air speed scale.
The wind gear and the wind arrow are
ed together.
12. Wind scale.
so ger and the
join-
B.
G, ven:
Drift on two headings.
2. Compass headings upon which drift readings
we re
taken.
3.
True
air speed in miles per hour.
C.
Te Find:
The dropping angle.
2. Driti on any heading.
Ground
speed on any
heading.
4. Direction
velocity of
the wind.
in
on
3.
and
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