From the Earth to the Moon, Direct in Ninety-Seven Hours and Twenty Minutes: and a Trip Round It

"And you pretend, Nicholl," asked Michel, "that by means of these hieroglyphics, more incomprehensible than the Egyptian Ibis, you can find what initiatory speed it was necessary to give to the projectile?"

"Incontestably," replied Nicholl; "and even by this same formula I can always tell you its speed at any point of its transit."

"On your word?"

"On my word."

"Then you are as cunning as our president."

"No, Michel; the difficult part is what Barbicane has done; that is, to get an equation which shall satisfy all the conditions of the problem. The remainder is only a question of arithmetic, requiring merely the knowledge of the four rules."

"That is something!" replied Michel Ardan, who for his life could not do addition right, and who defined the rule as a Chinese puzzle, which allowed one to obtain all sorts of totals.

"The expression v zero, which you see in that equation, is the speed which the projectile will have on leaving the atmosphere."

"Just so," said Nicholl; "it is from that point that we must calculate the velocity, since we know already that the velocity at departure was exactly one and a half times more than on leaving the atmosphere."

"I understand no more," said Michel.

"It is a very simple calculation," said Barbicane.

"Not as simple as I am," retorted Michel.

"That means, that when our projectile reached the limits of the terrestrial atmosphere it had already lost one-third of its initiatory speed."

"As much as that?"

"Yes, my friend; merely by friction against the atmospheric strata. You understand that the faster it goes the more resistance it meets with from the air."

"That I admit," answered Michel; "and I understand it, although your x's and zero's, and algebraic formulæ, are rattling in my head like nails in a bag."

"First effects of algebra," replied Barbicane; "and now, to finish, we are going to prove the given number of these different expressions, that is, work out their value."

"Finish me!" replied Michel.

Barbicane took the paper, and began again to make his calculations with great rapidity. Nicholl looked over and greedily read the work as it proceeded.

"That's it! that's it!" at last he cried.

"Is it clear?" asked Barbicane.

"It is written in letters of fire," said Nicholl.

"Wonderful fellows!" muttered Ardan.

"Do you understand it at last?" asked Barbicane.

"Do I understand it?" cried Ardan; "my head is splitting with it."

"And now," said Nicholl, "to find out the speed of the projectile when it left the atmosphere, we have only to calculate that."

The captain, as a practical man equal to all difficulties, began to write with frightful rapidity. Divisions and multiplications grew under his fingers; the figures were like hail on the white page. Barbicane watched him, whilst Michel Ardan nursed a growing headache with both hands.

"Very well?" asked Barbicane, after some minutes' silence.

"Well!" replied Nicholl; "every calculation made, v zero, that is to say, the speed necessary for the projectile on leaving the atmosphere, to enable it to reach the equal point of attraction, ought to be – "

"Yes?" said Barbicane.

"Twelve thousand yards."

"What!" exclaimed Barbicane, starting; "you say – "

"Twelve thousand yards."

"The devil!" cried the president, making a gesture of despair.

"What is the matter?" asked Michel Ardan, much surprised.

"What is the matter! why, if at this moment our speed had already diminished one-third by friction, the initiatory speed ought to have been – "

"Seventeen thousand yards."

"And the Cambridge Observatory declared that 12,000 yards was enough at starting; and our projectile, which only started with that speed – "

"Well?" asked Nicholl.

"Well, it will not be enough."

"Good."

"We shall not be able to reach the neutral point."

"The deuce!"

"We shall not even get half way."

"In the name of the projectile!" exclaimed Michel Ardan, jumping as if it was already on the point of striking the terrestrial globe.

"And we shall fall back upon the earth!"

CHAPTER V.

THE COLD OF SPACE

This revelation came like a thunderbolt. Who could have expected such an error in calculation? Barbicane would not believe it. Nicholl revised his figures: they were exact. As to the formula which had determined them, they could not suspect its truth; it was evident that an initiatory velocity of 17,000 yards in the first second was necessary to enable them to reach the neutral point.

The three friends looked at each other silently. There was no thought of breakfast. Barbicane, with clenched teeth, knitted brows, and hands clasped convulsively, was watching through the window. Nicholl had crossed his arms, and was examining his calculations. Michel Ardan was muttering, —