Abrams SC-1, Technical Manual

Page: 9 / 39

INTRODUCTION AND
DESCRIPTION
SECTION
I
INTRODUCTION
1.
This
manual
is
a
Handbook of
Instructions with
a
parts
list for
the
Universal
Sun Compass Model SC-1, a
direction
instrument
for
land navigation.
a.
This
Handbook contains descriptive data and
instructions
for
the
installation,
operation, maintenance, and disassembly
and assembly of
the
Sun Compass.
6.
The
Parts
List
contains
a
group assembly
parts list ar
ranged and intended
to
show
the
relationship of
single
parts
to
sub-assemblies and
of
the
sub-assemblies
to the
main
as
sembly.
Column
1
contains
a
list
of key numbers by which
each
part is
designated
on the
accompanying exploded view of
the instrument. Column
2
is
the
manufacturers
part
number
by
which
each
part
and sub-assemblies may
be
procured.
Col
umn
S
is
the
part
name
with
descriptive
information
on stand
ard commercial parts. Column
4
indicates the number
of
parts
in
a
sub-assembly, and the number
of
sub-assemblies
in
the
main assembly. When.
a
part
number is preceded by
an aster
isk ('*), this
indicates that
the
part is procurable in the
as^
sembly only.
SECTION
II
DESCRIPTION
1.
GENERAL DESCRIPTION.
a.
The
Universal
Sun Compass
is
a
mechanical device which
utilizes
the
azimuth of the sun
to
obtain true direction. The
instrument
is
ruggedly
built
and
can be used on
any
type
of
vehicle on which
it
can
be
mounted properly.
6.
The
sun compass has many definite advantages over
the
magnetic
compass.
It
is more rugged than
the
magnetic
com
pass. The sun compass
is
not affected by any local magnetic
attraction
such as
electrical
circuits
or metal as
is
the
case
with
the magnetic
compass. -
It
is
a
very accurate direction
instrument and has long
been used to
correct
errors
due
to
deviation of magnetic
compasses.
The
sun compass can only
be used
when the sun
is
shining, or
by
sighting
on the
north