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- Жюль Верн
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- Путешествие на Луну
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- Стр. 25/99
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The
resolutions
passed
at
the
last
meeting
produced
a
great
effect
out
of
doors
.
Timid
people
took
fright
at
the
idea
of
a
shot
weighing
20,000
pounds
being
launched
into
space
;
they
asked
what
cannon
could
ever
transmit
a
sufficient
velocity
to
such
a
mighty
mass
.
The
minutes
of
the
second
meeting
were
destined
triumphantly
to
answer
such
questions
.
The
following
evening
the
discussion
was
renewed
.
"
My
dear
colleagues
,
"
said
Barbicane
,
without
further
preamble
,
"
the
subject
now
before
us
is
the
construction
of
the
engine
,
its
length
,
its
composition
,
and
its
weight
.
It
is
probable
that
we
shall
end
by
giving
it
gigantic
dimensions
;
but
however
great
may
be
the
difficulties
in
the
way
,
our
mechanical
genius
will
readily
surmount
them
.
Be
good
enough
,
then
,
to
give
me
your
attention
,
and
do
not
hesitate
to
make
objections
at
the
close
.
I
have
no
fear
of
them
.
The
problem
before
us
is
how
to
communicate
an
initial
force
of
12,000
yards
per
second
to
a
shell
of
108
inches
in
diameter
,
weighing
20,000
pounds
.
Now
when
a
projectile
is
launched
into
space
,
what
happens
to
it
?
It
is
acted
upon
by
three
independent
forces
:
the
resistance
of
the
air
,
the
attraction
of
the
earth
,
and
the
force
of
impulsion
with
which
it
is
endowed
.
Let
us
examine
these
three
forces
.
The
resistance
of
the
air
is
of
little
importance
.
The
atmosphere
of
the
earth
does
not
exceed
forty
miles
.
Now
,
with
the
given
rapidity
,
the
projectile
will
have
traversed
this
in
five
seconds
,
and
the
period
is
too
brief
for
the
resistance
of
the
medium
to
be
regarded
otherwise
than
as
insignificant
.
Proceding
,
then
,
to
the
attraction
of
the
earth
,
that
is
,
the
weight
of
the
shell
,
we
know
that
this
weight
will
diminish
in
the
inverse
ratio
of
the
square
of
the
distance
.
When
a
body
left
to
itself
falls
to
the
surface
of
the
earth
,
it
falls
five
feet
in
the
first
second
;
and
if
the
same
body
were
removed
257,542
miles
further
off
,
in
other
words
,
to
the
distance
of
the
moon
,
its
fall
would
be
reduced
to
about
half
a
line
in
the
first
second
.
That
is
almost
equivalent
to
a
state
of
perfect
rest
.
Our
business
,
then
,
is
to
overcome
progressively
this
action
of
gravitation
.
The
mode
of
accomplishing
that
is
by
the
force
of
impulsion
.
"
"
There
's
the
difficulty
,
"
broke
in
the
major
.
"
True
,
"
replied
the
president
;
"
but
we
will
overcome
that
,
for
the
force
of
impulsion
will
depend
on
the
length
of
the
engine
and
the
powder
employed
,
the
latter
being
limited
only
by
the
resisting
power
of
the
former
.
Our
business
,
then
,
to-day
is
with
the
dimensions
of
the
cannon
.
"
"
Now
,
up
to
the
present
time
,
"
said
Barbicane
,
"
our
longest
guns
have
not
exceeded
twenty-five
feet
in
length
.
We
shall
therefore
astonish
the
world
by
the
dimensions
we
shall
be
obliged
to
adopt
.
It
must
evidently
be
,
then
,
a
gun
of
great
range
,
since
the
length
of
the
piece
will
increase
the
detention
of
the
gas
accumulated
behind
the
projectile
;
but
there
is
no
advantage
in
passing
certain
limits
.
"
"
Quite
so
,
"
said
the
major
.
"
What
is
the
rule
in
such
a
case
?
"
"
Ordinarily
the
length
of
a
gun
is
twenty
to
twenty-five
times
the
diameter
of
the
shot
,
and
its
weight
two
hundred
and
thirty-five
to
two
hundred
and
forty
times
that
of
the
shot
.
"
"
That
is
not
enough
,
"
cried
J.
T.
Maston
impetuously
.
