5.
Compass
M2.
level reflected in the mirror, by means
of the lever. Read the angle of site oppo-
site the index. Care must be exercised
to maintain the compass in a vertical
plane to obtain accurate readings.
f. Measuring Gun Elevation. Open the
cover and rear sight holder so that they
are parallel with the face of the compass.
Place the left side of the opened compass
on the leveling plates of the breech ring
or on a level portion of the piece which is
parallel to the bore, center the bubble of
6.
Compass
M2-bottom
view.
the elevation level, and read the angle of
the object sighted; then level the tubular
elevation.
Section Ill. OPERATION UNDER UNUSUAL CONDITIONS
14. General
In addition to the normal operating pro-
a. In temperatures below freezing it is
cedures for usual conditions described in
necessary that the moving parts be kept
section II, special instructions for operat-
absolutely free from moisture.
ing under unusual conditions are contained
b. Never breathe on glass in cold
herein. In addition to the normal
weather. This will serve only to aggravate
preventive-maintenance services (pars.
conditions already present and, in
extreme
through
24),
special
care
in
cleaning
cases, may even break the glass.
and
handling
must
be
observed
where
ex-
c. D o n o t b r i n g a n y m a t e r i e l i n d o o r s
tremes of temperature and atmospheric
unless it is absolutely necessary. It is best
conditions are present.
to leave it outdoors, but covered to
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