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- Жюль Верн
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- Стр. 96/526
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The
two
horizontal
distances
were
found
out
by
means
of
the
pole
,
whose
length
above
the
sand
was
exactly
ten
feet
.
The
first
distance
was
fifteen
feet
between
the
stick
and
the
place
where
the
pole
was
thrust
into
the
sand
.
The
second
distance
between
the
stick
and
the
bottom
of
the
cliff
was
five
hundred
feet
.
These
measurements
finished
,
Cyrus
Harding
and
the
lad
returned
to
the
Chimneys
.
The
engineer
then
took
a
flat
stone
which
he
had
brought
back
from
one
of
his
previous
excursions
,
a
sort
of
slate
,
on
which
it
was
easy
to
trace
figures
with
a
sharp
shell
.
He
then
proved
the
following
proportions
:
--
15:500
:
:10
:
x
500
x
10
=
5000
5000
15
=
333
.
3
From
which
it
was
proved
that
the
granite
cliff
measured
333
feet
in
height
.
Cyrus
Harding
then
took
the
instrument
which
he
had
made
the
evening
before
,
the
space
between
its
two
legs
giving
the
angular
distance
between
the
star
Alpha
and
the
horizon
.
He
measured
,
very
exactly
,
the
opening
of
this
angle
on
a
circumference
which
he
divided
into
360
equal
parts
.
