"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 s.p.a.ce 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 quant.i.ty 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 quant.i.ty of powder, while preserving to it its mechanical power."
"Good; but by what means?"
"I am going to tell you," replied Barbicane quietly.
"Nothing is more easy than to reduce this ma.s.s to one quarter of its bulk. You know that curious cellular matter which const.i.tutes the elementary tissues of vegetable? This substance is found quite pure in many bodies, especially in cotton, which is nothing more than the down of the seeds of the cotton plant.
Now cotton, combined with cold nitric acid, become transformed into a substance eminently insoluble, combustible, and explosive.
It was first discovered in 1832, by Braconnot, a French chemist, who called it xyloidine. In 1838 another Frenchman, Pelouze, investigated its different properties, and finally, in 1846, Schonbein, professor of chemistry at Bale, proposed its employment for purposes of war. This powder, now called pyroxyle, or fulminating cotton, is prepared with great facility by simply plunging cotton for fifteen minutes in nitric acid, then washing it in water, then drying it, and it is ready for use."
"Nothing could be more simple," said Morgan.
"Moreover, pyroxyle is unaltered by moisture-- a valuable property to us, inasmuch as it would take several days to charge the cannon. It ignites at 170 degrees in place of 240, and its combustion is so rapid that one may set light to it on the top of the ordinary powder, without the latter having time to ignite."
"Perfect!" exclaimed the major.
"Only it is more expensive."
"What matter?" cried J. T. Maston.
"Finally, it imparts to projectiles a velocity four times superior to that of gunpowder. I will even add, that if we mix it with one-eighth of its own weight of nitrate of pota.s.sium, its expansive force is again considerably augmented."
"Will that be necessary?" asked the major.
"I think not," replied Barbicane. "So, then, in place of 1,600,000 pounds of powder, we shall have but 400,000 pounds of fulminating cotton; and since we can, without danger, compress 500 pounds of cotton into twenty-seven cubic feet, the whole quant.i.ty will not occupy a height of more than 180 feet within the bore of the Columbiad. In this way the shot will have more than 700 feet of bore to traverse under a force of 6,000,000,000 litres of gas before taking its flight toward the moon."
At this juncture J. T. Maston could not repress his emotion; he flung himself into the arms of his friend with the violence of a projectile, and Barbicane would have been stove in if he had not been boom-proof.
This incident terminated the third meeting of the committee.
Barbicane and his bold colleagues, to whom nothing seemed impossible, had succeeding in solving the complex problems of projectile, cannon, and powder. Their plan was drawn up, and it only remained to put it into execution.
"A mere matter of detail, a bagatelle," said J. T. Maston.
CHAPTER X
ONE ENEMY _v._ TWENTY-FIVE MILLIONS OF FRIENDS
The American public took a lively interest in the smallest details of the enterprise of the Gun Club. It followed day by day the discussion of the committee. The most simple preparations for the great experiment, the questions of figures which it involved, the mechanical difficulties to be resolved-- in one word, the entire plan of work-- roused the popular excitement to the highest pitch.
The purely scientific attraction was suddenly intensified by the following incident:
We have seen what legions of admirers and friends Barbicane"s project had rallied round its author. There was, however, one single individual alone in all the States of the Union who protested against the attempt of the Gun Club. He attacked it furiously on every opportunity, and human nature is such that Barbicane felt more keenly the opposition of that one man than he did the applause of all the others. He was well aware of the motive of this antipathy, the origin of this solitary enmity, the cause of its personality and old standing, and in what rivalry of self-love it had its rise.
This persevering enemy the president of the Gun Club had never seen.
Fortunate that it was so, for a meeting between the two men would certainly have been attended with serious consequences. This rival was a man of science, like Barbicane himself, of a fiery, daring, and violent disposition; a pure Yankee. His name was Captain Nicholl; he lived at Philadelphia.
Most people are aware of the curious struggle which arose during the Federal war between the guns and armor of iron-plated ships.
The result was the entire reconstruction of the navy of both the continents; as the one grew heavier, the other became thicker in proportion. The Merrimac, the Monitor, the Tennessee, the Weehawken discharged enormous projectiles themselves, after having been armor-clad against the projectiles of others. In fact they did to others that which they would not they should do to them-- that grand principle of immortality upon which rests the whole art of war.
Now if Barbicane was a great founder of shot, Nicholl was a great forger of plates; the one cast night and day at Baltimore, the other forged day and night at Philadelphia. As soon as ever Barbicane invented a new shot, Nicholl invented a new plate; each followed a current of ideas essentially opposed to the other.
Happily for these citizens, so useful to their country, a distance of from fifty to sixty miles separated them from one another, and they had never yet met. Which of these two inventors had the advantage over the other it was difficult to decide from the results obtained. By last accounts, however, it would seem that the armor-plate would in the end have to give way to the shot; nevertheless, there were competent judges who had their doubts on the point.
At the last experiment the cylindro-conical projectiles of Barbicane stuck like so many pins in the Nicholl plates.
On that day the Philadelphia iron-forger then believed himself victorious, and could not evince contempt enough for his rival; but when the other afterward subst.i.tuted for conical shot simple 600-pound sh.e.l.ls, at very moderate velocity, the captain was obliged to give in. In fact, these projectiles knocked his best metal plate to shivers.
Matters were at this stage, and victory seemed to rest with the shot, when the war came to an end on the very day when Nicholl had completed a new armor-plate of wrought steel. It was a masterpiece of its kind, and bid defiance to all the projectiles of the world. The captain had it conveyed to the Polygon at Washington, challenging the president of the Gun Club to break it.
Barbicane, peace having been declared, declined to try the experiment.
Nicholl, now furious, offered to expose his plate to the shock of any shot, solid, hollow, round, or conical. Refused by the president, who did not choose to compromise his last success.
Nicholl, disgusted by this obstinacy, tried to tempt Barbicane by offering him every chance. He proposed to fix the plate within two hundred yards of the gun. Barbicane still obstinate in refusal. A hundred yards? Not even seventy-five!
"At fifty then!" roared the captain through the newspapers.
"At twenty-five yards! and I"ll stand behind!"
Barbicane returned for answer that, even if Captain Nicholl would be so good as to stand in front, he would not fire any more.
Nicholl could not contain himself at this reply; threw out hints of cowardice; that a man who refused to fire a cannon-shot was pretty near being afraid of it; that artillerists who fight at six miles distance are subst.i.tuting mathematical formulae for individual courage.
To these insinuations Barbicane returned no answer; perhaps he never heard of them, so absorbed was he in the calculations for his great enterprise.
When his famous communication was made to the Gun Club, the captain"s wrath pa.s.sed all bounds; with his intense jealousy was mingled a feeling of absolute impotence. How was he to invent anything to beat this 900-feet Columbiad? What armor-plate could ever resist a projectile of 30,000 pounds weight?
Overwhelmed at first under this violent shock, he by and by recovered himself, and resolved to crush the proposal by weight of his arguments.
He then violently attacked the labors of the Gun Club, published a number of letters in the newspapers, endeavored to prove Barbicane ignorant of the first principles of gunnery. He maintained that it was absolutely impossible to impress upon any body whatever a velocity of 12,000 yards per second; that even with such a velocity a projectile of such a weight could not transcend the limits of the earth"s atmosphere. Further still, even regarding the velocity to be acquired, and granting it to be sufficient, the sh.e.l.l could not resist the pressure of the gas developed by the ignition of 1,600,000 pounds of powder; and supposing it to resist that pressure, it would be less able to support that temperature; it would melt on quitting the Columbiad, and fall back in a red-hot shower upon the heads of the imprudent spectators.
Barbicane continued his work without regarding these attacks.
Nicholl then took up the question in its other aspects. Without touching upon its uselessness in all points of view, he regarded the experiment as fraught with extreme danger, both to the citizens, who might sanction by their presence so reprehensible a spectacle, and also to the towns in the neighborhood of this deplorable cannon. He also observed that if the projectile did not succeed in reaching its destination (a result absolutely impossible), it must inevitably fall back upon the earth, and that the shock of such a ma.s.s, multiplied by the square of its velocity, would seriously endanger every point of the globe.
Under the circ.u.mstances, therefore, and without interfering with the rights of free citizens, it was a case for the intervention of Government, which ought not to endanger the safety of all for the pleasure of one individual.
In spite of all his arguments, however, Captain Nicholl remained alone in his opinion. n.o.body listened to him, and he did not succeed in alienating a single admirer from the president of the Gun Club. The latter did not even take the pains to refute the arguments of his rival.