Read Online From the Earth to the Moon; and, Round the Moon by Jules Verne - Free Book Online
Authors: Jules Verne
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weight of the shot;
that is to say, if a 24-pounder shot requires sixteen pounds of
powder;— in other words, if in ordinary guns we employ a
quantity of powder equal to two-thirds of the weight of the
projectile, this proportion is not constant. Calculate, and you
will see that in place of three hundred and thirty-three pounds
of powder, the quantity is reduced to no more than one hundred
and sixty pounds."
"What are you aiming at?" asked the president.
"If you push your theory to extremes, my dear major," said J. T.
Maston, "you will get to this, that as soon as your shot becomes
sufficiently heavy you will not require any powder at all."
"Our friend Maston is always at his jokes, even in serious
matters," cried the major; "but let him make his mind easy, I am
going presently to propose gunpowder enough to satisfy his
artillerist's propensities. I only keep to statistical facts
when I say that, during the war, and for the very largest guns,
the weight of the powder was reduced, as the result of
experience, to a tenth part of the weight of the shot."
"Perfectly correct," said Morgan; "but before deciding the
quantity of powder necessary to give the impulse, I think it
would be as well——"
"We shall have to employ a large-grained powder," continued the
major; "its combustion is more rapid than that of the small."
"No doubt about that," replied Morgan; "but it is very
destructive, and ends by enlarging the bore of the pieces."
"Granted; but that which is injurious to a gun destined to
perform long service is not so to our Columbiad. We shall
run no danger of an explosion; and it is necessary that our
powder should take fire instantaneously in order that its
mechanical effect may be complete."
"We must have," said Maston, "several touch-holes, so as to fire
it at different points at the same time."
"Certainly," replied Elphinstone; "but that will render the
working of the piece more difficult. I return then to my
large-grained powder, which removes those difficulties.
In his Columbiad charges Rodman employed a powder as large
as chestnuts, made of willow charcoal, simply dried in cast-
iron pans. This powder was hard and glittering, left no trace
upon the hand, contained hydrogen and oxygen in large proportion,
took fire instantaneously, and, though very destructive, did not
sensibly injure the mouth-piece."
Up to this point Barbicane had kept aloof from the discussion;
he left the others to speak while he himself listened; he had
evidently got an idea. He now simply said, "Well, my friends,
what quantity of powder do you propose?"
The three members looked at one another.
"Two hundred thousand pounds." at last said Morgan.
"Five hundred thousand," added the major.
"Eight hundred thousand," screamed Maston.
A moment of silence followed this triple proposal; it was at
last broken by the president.
"Gentlemen," he quietly said, "I start from this principle, that
the resistance of a gun, constructed under the given conditions,
is unlimited. I shall surprise our friend Maston, then, by
stigmatizing his calculations as timid; and I propose to double
his 800,000 pounds of powder."
"Sixteen hundred thousand pounds?" shouted Maston, leaping from
his seat.
"Just so."
"We shall have to come then to my ideal of a cannon half a mile
long; for you see 1,600,000 pounds will occupy a space of about
20,000 cubic feet; and since the contents of your cannon do not
exceed 54,000 cubic feet, it would be half full; and the bore
will not be more than long enough for the gas to communicate to
the projectile sufficient impulse."
"Nevertheless," said the president, "I hold to that quantity
of powder. Now, 1,600,000 pounds of powder will create
6,000,000,000 litres of gas. Six thousand millions!
You quite understand?"
"What is to be done then?" said the general.
"The thing is very simple; we must reduce this enormous quantity
of powder, while preserving to it its mechanical power."
"Good; but by what means?"
"I am going to tell
that is to say, if a 24-pounder shot requires sixteen pounds of
powder;— in other words, if in ordinary guns we employ a
quantity of powder equal to two-thirds of the weight of the
projectile, this proportion is not constant. Calculate, and you
will see that in place of three hundred and thirty-three pounds
of powder, the quantity is reduced to no more than one hundred
and sixty pounds."
"What are you aiming at?" asked the president.
"If you push your theory to extremes, my dear major," said J. T.
Maston, "you will get to this, that as soon as your shot becomes
sufficiently heavy you will not require any powder at all."
"Our friend Maston is always at his jokes, even in serious
matters," cried the major; "but let him make his mind easy, I am
going presently to propose gunpowder enough to satisfy his
artillerist's propensities. I only keep to statistical facts
when I say that, during the war, and for the very largest guns,
the weight of the powder was reduced, as the result of
experience, to a tenth part of the weight of the shot."
"Perfectly correct," said Morgan; "but before deciding the
quantity of powder necessary to give the impulse, I think it
would be as well——"
"We shall have to employ a large-grained powder," continued the
major; "its combustion is more rapid than that of the small."
"No doubt about that," replied Morgan; "but it is very
destructive, and ends by enlarging the bore of the pieces."
"Granted; but that which is injurious to a gun destined to
perform long service is not so to our Columbiad. We shall
run no danger of an explosion; and it is necessary that our
powder should take fire instantaneously in order that its
mechanical effect may be complete."
"We must have," said Maston, "several touch-holes, so as to fire
it at different points at the same time."
"Certainly," replied Elphinstone; "but that will render the
working of the piece more difficult. I return then to my
large-grained powder, which removes those difficulties.
In his Columbiad charges Rodman employed a powder as large
as chestnuts, made of willow charcoal, simply dried in cast-
iron pans. This powder was hard and glittering, left no trace
upon the hand, contained hydrogen and oxygen in large proportion,
took fire instantaneously, and, though very destructive, did not
sensibly injure the mouth-piece."
Up to this point Barbicane had kept aloof from the discussion;
he left the others to speak while he himself listened; he had
evidently got an idea. He now simply said, "Well, my friends,
what quantity of powder do you propose?"
The three members looked at one another.
"Two hundred thousand pounds." at last said Morgan.
"Five hundred thousand," added the major.
"Eight hundred thousand," screamed Maston.
A moment of silence followed this triple proposal; it was at
last broken by the president.
"Gentlemen," he quietly said, "I start from this principle, that
the resistance of a gun, constructed under the given conditions,
is unlimited. I shall surprise our friend Maston, then, by
stigmatizing his calculations as timid; and I propose to double
his 800,000 pounds of powder."
"Sixteen hundred thousand pounds?" shouted Maston, leaping from
his seat.
"Just so."
"We shall have to come then to my ideal of a cannon half a mile
long; for you see 1,600,000 pounds will occupy a space of about
20,000 cubic feet; and since the contents of your cannon do not
exceed 54,000 cubic feet, it would be half full; and the bore
will not be more than long enough for the gas to communicate to
the projectile sufficient impulse."
"Nevertheless," said the president, "I hold to that quantity
of powder. Now, 1,600,000 pounds of powder will create
6,000,000,000 litres of gas. Six thousand millions!
You quite understand?"
"What is to be done then?" said the general.
"The thing is very simple; we must reduce this enormous quantity
of powder, while preserving to it its mechanical power."
"Good; but by what means?"
"I am going to tell
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