Abrams SC-1, Техническое руководство

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MAINTENANCE MANUAL
On
a
tank,
it
should
be
mounted outside the
turret
where the
tank commander can
observe
it
when the hatch
is
open.
6.
A
bracket
made
of
% in. x 2
in. strap iron, which can be
bolted
to
an appropriate place
on
the vehicle, provides
a
suit
able
mount
for
the
compass.
o.
The compass must
be
mounted
so
that
the
0-180 degree
line
on
the
protractor
is
parallel
to the center-line
of
the
vehicle,
with
the
arrowhead at the
0 degree
mark
pointing in
the direction
of
the
forward
travel
of
the vehicle.
It
is
fas
tened
securely
to
the mounting bracket, or
directly
to the
vehicle,
by
two bolts.
If
a
bracket
is
used,
this furnishes
a
means of permanently
aligning
the compass
parallel
to the
center line of the vehicle
(see
paragraph
d).
Unless the
com
pass mount
is
permanently marked
for
alignment,
it
must
be
realigned
if
it
becomes
necessary
to remove
the compass
for
any reason.
d.
A
method of mounting and
aligning
the
compass
using
a
mounting bracket
follows:
(1) Select
a
mounting position where the compass
is
readily
accessible
to the
operator and where
sunlight will fall
unob
structed
on
its
surface.
(2) Install the
strap
iron
mounting bracket perpendicular
to
the center line of the vehicle.
(3)
Drill
two
*%a
in. diameter holes
spaced
1% inches,
cen
ter
to
center,
in
the mounting bracket, approximately perpen
dicular
to
the center
line
of
the
vehicle.
There is
only
%z
ad
justment due
to
enlarged holes
in
the compass lower support
member so that
a
line connecting the centers
of
these
two
holes must
be
very nearly perpendicular
to
the center line
of
the
vehicle.
(4) Secure the compass lower support member to the mount
ing bracket with
one
bolt,
so
that the
arrow
on
the
protractor
points
in
the direction of forward
travel.
(5)
Measure
the
distance
(C-B,
figure 4)
from
the center
of
the vehicle
to the
center
of
the
compass.
(6)
At
some
point (at least
6
feet ahead
of
the
vehicle)
again determine
the
center
of
the vehicle
(point
D).