general.

"Until now," said Barbicane, "the longest cannon, our enormous
Columbiads, have not been more than twenty-five feet long; we shall
therefore astonish many people by the dimensions we shall have to
adopt."

"Certainly," exclaimed J.T. Maston. "For my part, I ask for a cannon
half a mile long at least!"

"Half a mile!" cried the major and the general.

"Yes, half a mile, and that will be half too short."

"Come, Maston," answered Morgan, "you exaggerate."

"No, I do not," said the irate secretary; "and I really do not know why
you tax me with exaggeration."

"Because you go too far."

"You must know, sir," answered J.T. Maston, looking dignified, "that an
artilleryman is like a cannon-ball, he can never go too far."

The debate was getting personal, but the president interfered.

"Be calm, my friends, and let us reason it out. We evidently want a gun
of great range, as the length of the engine will increase the detention
of gas accumulated behind the projectile, but it is useless to overstep
certain limits."

"Perfectly," said the major.

"What are the usual rules in such a case? Ordinarily the length of a
cannon is twenty or twenty-five times the diameter of the projectile,
and it weighs 235 to 240 times its weight."

"It is not enough," cried J.T. Maston with impetuosity.

"I agree to that, my worthy friend, and in fact by keeping that
proportion for a projectile nine feet wide, weighing 30,000 lbs., the
engine would only have a length of 225 feet and a weight of 7,200,000
lbs."

"That is ridiculous," resumed J.T. Maston. "You might as well take a
pistol."

"I think so too," answered Barbicane; "that is why I propose to
quadruple that length, and to construct a cannon 900 feet long."

The general and the major made some objections, but, nevertheless, this
proposition, strongly supported by the secretary, was definitely
adopted.

"Now," said Elphinstone, "what thickness must we give its sides?"

"A thickness of six feet," answered Barbicane.

"You do not think of raising such a mass upon a gun-carriage?" asked the
major.

"That would be superb, however! said J.T. Maston.

"But impracticable," answered Barbicane. "No, I think of casting this
engine in the ground itself, binding it up with wrought-iron hoops, and
then surrounding it with a thick mass of stone and cement masonry. When
it is cast it must be bored with great precision so as to prevent
windage, so there will be no loss o