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165
The Aeroplane Speaks. Fifth Edition
·
H. Barber
106
WIRES.--The
following
points
should
be
carefully
observed
where
wire
is
concerned:
1.
Quality.--It
must
not
be
too
hard
or
too
soft.
An
easy
practical
way
of
learning
to
know
the
approximate
quality
of
wire
is
as
follows:
Take
three
pieces,
all
of
the
same
gauge,
and
each
about
a
foot
in
length.
One
piece
should
be
too
soft,
another
too
hard,
and
the
third
piece
of
the
right
quality.
Fix
them
in
a
vice,
about
an
inch
apart
and
in
a
vertical
position,
and
with
the
light
from
a
window
shining
upon
them.
Burnish
them
if
necessary,
and
you
will
see
a
band
of
light
reflected
from
each
wire.
Now
bend
the
wires
over
as
far
as
possible
and
away
from
the
light.
Where
the
soft
wire
is
concerned,
it
will
squash
out
at
the
bend,
and
this
will
be
indicated
by
the
band
of
light,
which
will
broaden
at
that
point.
In
the
case
of
the
wire
which
is
too
hard,
the
band
of
light
will
broaden
very
little
at
the
turn,
but,
if
you
look
carefully,
you
will
see
some
little
roughness
of
surface.
In
the
case
of
the
wire
of
the
right
quality,
the
band
of
light
may
broaden
a
very
little
at
the
turn,
but
there
will
be
no
roughness
of
surface.
By
making
this
experiment
two
or
three
times
one
can
soon
learn
to
know
really
bad
wire
from
good,
and
also
learn
to
know
the
strength
of
hand
necessary
to
bend
the
right
quality.
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