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165
The Aeroplane Speaks. Fifth Edition
·
H. Barber
45
"Yes,
sir,"
he
replies,
"and
everything
else
all
correct.
Propeller,
engine,
and
body
covers
on
board,
sir;
tool
kit
checked
over
and
in
the
locker;
engine
and
Aeroplane
logbooks
written
up,
signed,
and
under
your
seat;
engine
revs.
up
to
mark,
and
all
the
control
cables
in
perfect
condition
and
tension."
"Very
good,"
said
the
Pilot;
and
then
turning
to
the
Observer,
"Before
we
start
you
had
better
have
a
look
at
the
course
I
have
mapped
out
(see
p.
40).
"A
is
where
we
stand
and
we
have
to
reach
B,
a
hundred
and
fifty
miles
due
North.
I
judge
that,
at
the
altitude
we
shall
fly,
there
will
be
an
East
wind,
for
although
it
is
not
quite
East
on
the
ground
it
is
probably
about
twenty
degrees
different
aloft,
the
wind
usually
moving
round
clockways
to
about
that
extent.
I
think
that
it
is
blowing
at
the
rate
of
about
fifty
miles
an
hour,
and
I
therefore
take
a
line
on
the
map
to
C,
fifty
miles
due
West
of
A.
The
Aeroplane's
speed
is
a
hundred
miles
an
hour,
and
so
I
take
a
line
of
one
hundred
miles
from
C
to
D.
Our
compass
course
will
then
be
in
the
direction
A--E,
which
is
always
a
line
parallel
to
C--D.
That
is,
to
be
exact,
it
will
be
fourteen
degrees
off
the
C--D
course,
as,
in
this
part
of
the
globe,
there
is
that
much
difference
between
the
North
and
South
lines
on
the
map
and
the
magnetic
North
to
which
the
compass
needle
points.
If
the
compass
has
an
error,
as
it
may
have
of
a
few
degrees,
that,
too,
must
be
taken
into
account,
and
the
deviation
or
error
curve
on
the
dashboard
will
indicate
it.
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