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- Путешествие на Луну
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- Стр. 22/99
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"
Simply
cast
iron
,
"
said
General
Morgan
.
"
But
,
"
interrupted
the
major
,
"
since
the
weight
of
a
shot
is
proportionate
to
its
volume
,
an
iron
ball
of
nine
feet
in
diameter
would
be
of
tremendous
weight
.
"
"
Yes
,
if
it
were
solid
,
not
if
it
were
hollow
.
"
"
Hollow
?
then
it
would
be
a
shell
?
"
"
Yes
,
a
shell
,
"
replied
Barbicane
;
"
decidely
it
must
be
.
A
solid
shot
of
108
inches
would
weigh
more
than
200,000
pounds
,
a
weight
evidently
far
too
great
.
Still
,
as
we
must
reserve
a
certain
stability
for
our
projectile
,
I
propose
to
give
it
a
weight
of
20,000
pounds
.
"
"
What
,
then
,
will
be
the
thickness
of
the
sides
?
"
asked
the
major
.
"
If
we
follow
the
usual
proportion
,
"
replied
Morgan
,
"
a
diameter
of
108
inches
would
require
sides
of
two
feet
thickness
,
or
less
.
"
"
That
would
be
too
much
,
"
replied
Barbicane
;
"
for
you
will
observe
that
the
question
is
not
that
of
a
shot
intended
to
pierce
an
iron
plate
;
it
will
suffice
to
give
it
sides
strong
enough
to
resist
the
pressure
of
the
gas
.
The
problem
,
therefore
,
is
this
--
What
thickness
ought
a
cast-iron
shell
to
have
in
order
not
to
weight
more
than
20,000
pounds
?
Our
clever
secretary
will
soon
enlighten
us
upon
this
point
.
"
"
Nothing
easier
.
"
replied
the
worthy
secretary
of
the
committee
;
and
,
rapidly
tracing
a
few
algebraical
formulae
upon
paper
,
among
which
n
^
2
and
x
^
2
frequently
appeared
,
he
presently
said
:
"
The
sides
will
require
a
thickness
of
less
than
two
inches
.
"
