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165
The Aeroplane Speaks. Fifth Edition
·
H. Barber
112
The
tension
of
the
internal
bracing
wires
should
be
just
sufficient
to
give
rigidity
to
the
framework.
They
should
not
be
tensioned
above
that
unless
the
wires
are,
at
their
ends,
bent
to
form
loops.
In
that
case
a
little
extra
tension
may
be
given
to
offset
the
probable
elongation
of
the
loops.
The
turnbuckles
must
now
be
generously
greased,
and
served
round
with
adhesive
tape.
The
wires
must
be
rendered
perfectly
dry
and
clean,
and
then
painted
with
an
anti-rust
mixture.
The
woodwork
must
be
well
varnished.
If
it
is
necessary
to
bore
holes
in
the
spars
for
the
purpose
of
receiving,
for
instance,
socket
bolts,
then
their
places
should
be
marked
before
being
bored
and
their
positions
confirmed
by
whoever
is
in
charge
of
the
workshop.
All
is
now
ready
for
the
sail-maker
to
cover
the
surface
with
fabric.
ADJUSTMENT
OF
CONTROL
CABLES.--The
adjustment
of
the
control
cables
is
quite
an
art,
and
upon
it
will
depend
to
a
large
degree
the
quick
and
easy
control
of
the
aeroplane
by
the
pilot.
The
method
is
as
follows:
After
having
rigged
the
controlling
surfaces,
and
as
far
as
possible
secured
the
correct
adjustment
of
the
control
cables,
then
remove
the
packing
which
has
kept
the
control
levers
rigid.
Then,
sitting
in
the
pilot's
seat,
move
the
control
levers
smartly.
Tension
the
control
cables
so
that
when
the
levers
are
smartly
moved
there
is
no
perceptible
snatch
or
lag.
Be
careful
not
to
tension
the
cables
more
than
necessary
to
take
out
the
snatch.
If
tensioned
too
much
they
will
(1)
bind
round
the
pulleys
and
result
in
hard
work
for
the
pilot;
(2)
throw
dangerous
stresses
upon
the
controlling
surfaces,
which
are
of
rather
flimsy
construction;
and
(3)
cause
the
cables
to
fray
round
the
pulleys
quicker
than
would
otherwise
be
the
case.
Marker
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Fine marker
White-out
Fine white-out
Circle
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Unmarker
Hand
Scalpel
Dice
Sieve
Purify
Undo
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