Gallia Weighed

: BOOK II

A quarter of an hour later, the visitors to the Hansa had reassembled

in the common hall of Nina's Hive.



"Now, gentlemen, we can proceed," said the professor. "May I request

that this table may be cleared?"



Ben Zoof removed the various articles that were lying on the table, and

the coins which had just been borrowed from the Jew were placed upon it

in three piles, according to their value.
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The professor commenced. "Since none of you gentlemen, at the time

of the shock, took the precaution to save either a meter measure or

a kilogramme weight from the earth, and since both these articles are

necessary for the calculation on which we are engaged, I have been

obliged to devise means of my own to replace them."



This exordium delivered, he paused and seemed to watch its effect

upon his audience, who, however, were too well acquainted with the

professor's temper to make any attempt to exonerate themselves from the

rebuke of carelessness, and submitted silently to the implied reproach.



"I have taken pains," he continued, "to satisfy myself that these

coins are in proper condition for my purpose. I find them unworn and

unchipped; indeed, they are almost new. They have been hoarded instead

of circulated; accordingly, they are fit to be utilized for my purpose

of obtaining the precise length of a terrestrial meter."



Ben Zoof looked on in perplexity, regarding the lecturer with much the

same curiosity as he would have watched the performances of a traveling

mountebank at a fair in Montmartre; but Servadac and his two friends had

already divined the professor's meaning. They knew that French coinage

is all decimal, the franc being the standard of which the other coins,

whether gold, silver, or copper, are multiples or measures; they knew,

too, that the caliber or diameter of each piece of money is rigorously

determined by law, and that the diameters of the silver coins

representing five francs, two francs, and fifty centimes measure

thirty-seven, twenty-seven, and eighteen millimeters respectively; and

they accordingly guessed that Professor Rosette had conceived the plan

of placing such a number of these coins in juxtaposition that the

length of their united diameters should measure exactly the thousand

millimeters that make up the terrestrial meter.



The measurement thus obtained was by means of a pair of compasses

divided accurately into ten equal portions, or decimeters, each of

course 3.93 inches long. A lath was then cut of this exact length and

given to the engineer of the Dobryna, who was directed to cut out of

the solid rock the cubic decimeter required by the professor.



The next business was to obtain the precise weight of a kilogramme. This

was by no means a difficult matter. Not only the diameters, but also the

weights, of the French coins are rigidly determined by law, and as the

silver five-franc pieces always weigh exactly twenty-five grammes,

the united weight of forty of these coins is known to amount to one

kilogramme.



"Oh!" cried Ben Zoof; "to be able to do all this I see you must be rich

as well as learned."



With a good-natured laugh at the orderly's remark, the meeting adjourned

for a few hours. By the appointed time the engineer had finished his

task, and with all due care had prepared a cubic decimeter of the

material of the comet.



"Now, gentlemen," said Professor Rosette, "we are in a position to

complete our calculation; we can now arrive at Gallia's attraction,

density, and mass."



Everyone gave him his complete attention.



"Before I proceed," he resumed, "I must recall to your minds Newton's

general law, 'that the attraction of two bodies is directly proportional

to the product of their masses, and inversely proportional to the square

of their distances.'"



"Yes," said Servadac; "we remember that."



"Well, then," continued the professor, "keep it in mind for a

few minutes now. Look here! In this bag are forty five-franc

pieces--altogether they weigh exactly a kilogramme; by which I mean that

if we were on the earth, and I were to hang the bag on the hook of the

steelyard, the indicator on the dial would register one kilogramme. This

is clear enough, I suppose?"



As he spoke the professor designedly kept his eyes fixed upon Ben Zoof.

He was avowedly following the example of Arago, who was accustomed

always in lecturing to watch the countenance of the least intelligent

of his audience, and when he felt that he had made his meaning clear to

him, he concluded that he must have succeeded with all the rest. In

this case, however, it was technical ignorance, rather than any lack

of intelligence, that justified the selection of the orderly for this

special attention.



Satisfied with his scrutiny of Ben Zoof's face, the professor went on.

"And now, gentlemen, we have to see what these coins weigh here upon

Gallia."



He suspended the money bag to the hook; the needle oscillated, and

stopped. "Read it off!" he said.



The weight registered was one hundred and thirty-three grammes.



"There, gentlemen, one hundred and thirty-three grammes! Less than

one-seventh of a kilogramme! You see, consequently, that the force of

gravity here on Gallia is not one-seventh of what it is upon the earth!"



"Interesting!" cried Servadac, "most interesting! But let us go on and

compute the mass."



"No, captain, the density first," said Rosette.



"Certainly," said the lieutenant; "for, as we already know the volume,

we can determine the mass as soon as we have ascertained the density."



The professor took up the cube of rock. "You know what this is," he went

on to say. "You know, gentlemen, that this block is a cube hewn from

the substance of which everywhere, all throughout your voyage of

circumnavigation, you found Gallia to be composed--a substance to which

your geological attainments did not suffice to assign a name."



"Our curiosity will be gratified," said Servadac, "if you will enlighten

our ignorance."



But Rosette did not take the slightest notice of the interruption.



"A substance it is which no doubt constitutes the sole material of

the comet, extending from its surface to its innermost depths. The

probability is that it would be so; your experience confirms that

probability: you have found no trace of any other substance. Of this

rock here is a solid decimeter; let us get at its weight, and we shall

have the key which will unlock the problem of the whole weight of

Gallia. We have demonstrated that the force of attraction here is only

one-seventh of what it is upon the earth, and shall consequently have to

multiply the apparent weight of our cube by seven, in order to ascertain

its proper weight. Do you understand me, goggle-eyes?"



This was addressed to Ben Zoof, who was staring hard at him. "No!" said

Ben Zoof.



"I thought not; it is of no use waiting for your puzzle-brains to make

it out. I must talk to those who can understand."



The professor took the cube, and, on attaching it to the hook of the

steelyard, found that its apparent weight was one kilogramme and four

hundred and thirty grammes.



"Here it is, gentlemen; one kilogramme, four hundred and thirty grammes.

Multiply that by seven; the product is, as nearly as possible, ten

kilogrammes. What, therefore, is our conclusion? Why, that the density

of Gallia is just about double the density of the earth, which we know

is only five kilogrammes to a cubic decimeter. Had it not been for

this greater density, the attraction of Gallia would only have been

one-fifteenth instead of one-seventh of the terrestrial attraction."



The professor could not refrain from exhibiting his gratification that,

however inferior in volume, in density, at least, his comet had the

advantage over the earth.



Nothing further now remained than to apply the investigations thus

finished to the determining of the mass or weight. This was a matter of

little labor.



"Let me see," said the captain; "what is the force of gravity upon the

various planets?"



"You can't mean, Servadac, that you have forgotten that? But you always

were a disappointing pupil."



The captain could not help himself: he was forced to confess that his

memory had failed him.



"Well, then," said the professor, "I must remind you. Taking the

attraction on the earth as 1, that on Mercury is 1.15, on Venus it

is.92, on Mars.5, and on Jupiter 2.45; on the moon the attraction is.16,

whilst on the surface of the sun a terrestrial kilogramme would weigh 28

kilogrammes."



"Therefore, if a man upon the surface of the sun were to fall down, he

would have considerable difficulty in getting up again. A cannon ball,

too, would only fly a few yards," said Lieutenant Procope.



"A jolly battle-field for cowards!" exclaimed Ben Zoof.



"Not so jolly, Ben Zoof, as you fancy," said his master; "the cowards

would be too heavy to run away."



Ben Zoof ventured the remark that, as the smallness of Gallia secured to

its inhabitants such an increase of strength and agility, he was almost

sorry that it had not been a little smaller still.



"Though it could not anyhow have been very much smaller," he added,

looking slyly at the professor.



"Idiot!" exclaimed Rosette. "Your head is too light already; a puff of

wind would blow it away."



"I must take care of my head, then, and hold it on," replied the

irrepressible orderly.



Unable to get the last word, the professor was about to retire, when

Servadac detained him.



"Permit me to ask you one more question," he said. "Can you tell me what

is the nature of the soil of Gallia?"



"Yes, I can answer that. And in this matter I do not think your

impertinent orderly will venture to put Montmartre into the comparison.

This soil is of a substance not unknown upon the earth." And speaking

very slowly, the professor said: "It contains 70 per cent. of tellurium,

and 30 per cent. of gold."



Servadac uttered an exclamation of surprise.



"And the sum of the specific gravities of these two substances is 10,

precisely the number that represents Gallia's density."



"A comet of gold!" ejaculated the captain.



"Yes; a realization of what the illustrious Maupertuis has already

deemed probable," replied the astronomer.



"If Gallia, then, should ever become attached to the earth, might it not

bring about an important revolution in all monetary affairs?" inquired

the count.



"No doubt about it!" said Rosette, with manifest satisfaction. "It would

supply the world with about 246,000 trillions of francs."



"It would make gold about as cheap as dirt, I suppose," said Servadac.



The last observation, however, was entirely lost upon the professor, who

had left the hall with an air almost majestic, and was already on his

way to the observatory.



"And what, I wonder, is the use of all these big figures?" said Ben Zoof

to his master, when next day they were alone together.



"That's just the charm of them, my good fellow," was the captain's cool

reply, "that they are of no use whatever."



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