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165
The Aeroplane Speaks. Fifth Edition
·
H. Barber
113
Now,
after
having
tensioned
the
cables
sufficiently
to
take
out
the
snatch,
place
the
levers
in
their
neutral
positions,
and
move
them
to
and
fro
about
1/8
inch
either
side
of
such
positions.
If
the
adjustment
is
correct,
it
should
be
possible
to
see
the
controlling
surfaces
move.
If
they
do
not
move,
then
the
control
cables
are
too
slack.
FLYING
POSITION.--Before
rigging
an
aeroplane
or
making
any
adjustments
it
is
necessary
to
place
it
in
what
is
known
as
its
"flying
position."
I
may
add
that
it
would
be
better
termed
its
"rigging
position."
In
the
case
of
an
aeroplane
fitted
with
a
stationary
engine
this
is
secured
by
packing
up
the
machine
so
that
the
engine
foundations
are
perfectly
horizontal
both
longitudinally
and
laterally.
This
position
is
found
by
placing
a
straight-edge
and
a
spirit-level
across
the
engine
foundations
(both
longitudinally
and
laterally),
and
great
care
should
be
taken
to
see
that
the
bubble
is
exactly
in
the
centre
of
the
level.
The
slightest
error
will
assume
magnitude
towards
the
extremities
of
the
aeroplane.
Great
care
should
be
taken
to
block
up
the
aeroplane
rigidly.
In
case
it
gets
accidentally
disturbed
while
the
work
is
going
on,
it
is
well
to
constantly
verify
the
flying
position
by
running
the
straight-edge
and
spirit-level
over
the
engine
foundations.
The
straight-edge
should
be
carefully
tested
before
being
used,
as,
being
generally
made
of
wood,
it
will
not
remain
true
long.
Place
it
lightly
in
a
vice,
and
in
such
a
position
that
a
spirit-level
on
top
shows
the
bubble
exactly
in
the
centre.
Now
slowly
move
the
level
along
the
straight-edge,
and
the
bubble
should
remain
exactly
in
the
centre.
If
it
does
not
do
so,
then
the
straight-edge
is
not
true
and
must
be
corrected.
This
should
never
be
omitted.
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