The Past Through Tomorrow (95 page)

The voice of a mess mate sounded in Libby’s earphones, “Jeepers! That horizon looks close. I’ll bet it ain’t more’n a mile away.”

Libby looked out over the flat bare plain and subconsciously considered the matter. “It’s less,” he commented, “than a third of a mile away.”

“What the hell do you know about it, Pinkie? And who asked you, anyhow?”

Libby answered defensively, “As a matter of fact, it’s one thousand six hundred and seventy feet, figuring that my eyes are five feet three inches above ground level.”

“Nuts. Pinkie, you are always trying to show off how much you think you know.”

“Why, I am not,” Libby protested. “If this body is a hundred miles thick and as round as it looks: why, naturally the horizon
has
to be just that far away.”

“Says
who
?”

McCoy interrupted.

“Pipe down! Libby is a lot nearer right than you were.”

“He is exactly right,” put in a strange voice. “I had to look it up for the navigator before I left control.”

“Is that so?”—McCoy’s voice again—“If the Chief Quartermaster says you’re right, Libby, you’re right. How did you know?”

Libby flushed miserably. “I—I don’t know. That’s the only way it could be.”

The gunner’s mate and the quartermaster stared at him but dropped the subject.

By the end of the ‘day’ (ship’s time, for Eighty-eight had a period of eight hours and thirteen minutes), work was well under way. The transport had grounded close by a low range of hills. The Captain selected a little bowl-shaped depression in the hills, some thousand feet long and half as broad, in which to establish a permanent camp. This was to be roofed over, sealed, and an atmosphere provided.

In the hill between the ship and the valley, quarters were to be excavated; dormitories, mess hall, officers’ quarters, sick bay, recreation room, offices, store rooms, and so forth. A tunnel must be bored through the hill, connecting the sites of these rooms, and connecting with a ten foot airtight metal tube sealed to the ship’s portside air-lock. Both the tube and tunnel were to be equipped with a continuous conveyor belt for passengers and freight.

Libby found himself assigned to the roofing detail. He helped a metal-smith struggle over the hill with a portable atomic heater, difficult to handle because of a mass of eight hundred pounds, but weighing here only sixteen pounds. The rest of the roofing detail were breaking out and preparing to move by hand the enormous translucent tent which was to be the ‘sky’ of the little valley.

The metalsmith located a landmark on the inner slope of the valley, set up his heater, and commenced cutting a deep horizontal groove or step in the rock. He kept it always at the same level by following a chalk mark drawn along the rock wall. Libby enquired how the job had been surveyed so quickly.

“Easy,” he was answered, “two of the quartermasters went ahead with a transit, leveled it just fifty feet above the valley floor, and clamped a searchlight to it. Then one of ’em ran like hell around the rim, making chalk marks at the height at which the beam struck.”

“Is this roof going to be just fifty feet high?”

“No, it will average maybe a hundred. It bellies up in the middle from the air pressure.”

“Earth normal?”

“Half Earth normal.”

Libby concentrated for an instant, then looked puzzled. “But look—This valley is a thousand feet long and better than five hundred wide. At half of fifteen pounds per square inch, and allowing for the arch of the roof, that’s a load of one and an eighth billion pounds. What fabric can take that kind of a load?”

“Cobwebs.”

“Cobwebs?”

“Yeah, cobwebs. Strongest stuff in the world, stronger than the best steel. Synthetic spider silk. This gauge we’re using for the roof has a tensile strength of four thousand pounds a running inch.”

Libby hesitated a second, then replied, “I see. With a rim about eighteen hundred thousand inches around, the maximum pull at the point of anchoring would be about six hundred and twenty-five pounds per inch. Plenty safe margin.”

The metalsmith leaned on his tool and nodded. “Something like that. You’re pretty quick at arithmetic, aren’t you, bud?”

Libby looked startled. “I just like to get things straight.”

They worked rapidly around the slope, cutting a clean smooth groove to which the ‘cobweb’ could be anchored and sealed. The white-hot lava spewed out of the discharge vent and ran slowly down the hillside. A brown vapor boiled off the surface of the molten rock, arose a few feet and sublimed almost at once in the vacuum to white powder which settled to the ground. The metalsmith pointed to the powder.

“That stuff ’ud cause silicosis if we let it stay there, and breathed it later.”

“What do you do about it?”

“Just clean it out with the blowers of the air conditioning plant.”

Libby took this opening to ask another question. “Mister—?”

“Johnson’s my name. No mister necessary.”

“Well, Johnson, where do we get the air for this whole valley, not to mention the tunnels? I figure we must need twenty-five million cubic feet or more. Do we manufacture it?”

“Naw, that’s too much trouble. We brought it with us.”

“On the transport?”

“Uh huh, at fifty atmospheres.”

Libby considered this. “I see—that way it would go into a space eighty feet on a side.”

“Matter of fact it’s in three specially constructed holds—giant air bottles. This transport carried air to Ganymede. I was in her then—a recruit, but in the air gang even then.”

In three weeks the permanent camp was ready for occupancy and the transport cleared of its cargo. The storerooms bulged with tools and supplies. Captain Doyle had moved his administrative offices underground, signed over his command to his first officer, and given him permission to proceed on ‘duty assigned’—in this case; return to Terra with a skeleton crew.

Libby watched them take off from a vantage point on the hillside. An overpowering homesickness took possession of him. Would he ever go home? He honestly believed at the time that he would swap the rest of his life for thirty minutes each with his mother and with Betty.

He started down the hill toward the tunnel lock. At least the transport carried letters to them, and with any luck the chaplain would be by soon with letters from Earth. But tomorrow and the days after that would be no fun. He had enjoyed being in the air gang, but tomorrow he went back to his squad. He did not relish that—the boys in his squad were all right, he guessed, but he just could not seem to fit in.

This company of the C.C.C. started on its bigger job; to pock-mark Eighty-eight with rocket tubes so that Captain Doyle could push this hundred-mile marble out of her orbit and herd her in to a new orbit between Earth and Mars, to be used as a space station—a refuge for ships in distress, a haven for life boats, a fueling stop, a naval outpost.

Libby was assigned to a heater in pit H-16. It was his business to carve out carefully calculated emplacements in which the blasting crew then set off the minute charges which accomplished the major part of the excavating. Two squads were assigned to H-16, under the general supervision of an elderly marine gunner. The gunner sat on the edge of the pit, handling the plans, and occasionally making calculations on a circular slide rule which hung from a lanyard around his neck.

Libby had just completed a tricky piece of cutting for a three-stage blast, and was waiting for the blasters, when his phones picked up the gunner’s instructions concerning the size of the charge. He pressed his transmitter button.

“Mr. Larsen! You’ve made a mistake!”

“Who said that?”

“This is Libby. You’ve made a mistake in the charge. If you set off that charge, you’ll blow this pit right out of the ground, and us with it.”

Marine Gunner Larsen spun the dials on his slide rule before replying, “You’re all het up over nothing, son. That charge is correct.”

“No, I’m not, sir,” Libby persisted, “you’ve multiplied where you should have divided.”

“Have you had any experience at this sort of work?”

“No, sir.”

Larsen addressed his next remark to the blasters. “Set the charge.”

They started to comply. Libby gulped, and wiped his lips with his tongue. He knew what he had to do, but he was afraid. Two clumsy stiff-legged jumps placed him beside the blasters. He pushed between them and tore the electrodes from the detonator. A shadow passed over him as he worked, and Larsen floated down beside him. A hand grasped his arm.

“You shouldn’t have done that, son. That’s direct disobedience of orders. I’ll have to report you.” He commenced reconnecting the firing circuit.

Libby’s ears burned with embarrassment, but he answered back with the courage of timidity at bay. “I had to do it, sir. You’re still wrong.”

Larsen paused and ran his eyes over the dogged face. “Well—it’s a waste of time, but I don’t like to make you stand by a charge you’re afraid of. Let’s go over the calculation together.”

Captain Doyle sat at his ease in his quarters, his feet on his desk. He stared at a nearly empty glass tumbler.

“That’s good beer, Blackie. Do you suppose we could brew some more when it’s gone?”

“I don’t know, Cap’n. Did we bring any yeast?”

“Find out, will you?” He turned to a massive man who occupied the third chair. “Well, Larsen, I’m glad it wasn’t any worse than it was.”

“What beats me, Captain, is how I could have made such a mistake. I worked it through twice. If it had been a nitro explosive, I’d have known off hand that I was wrong. If this kid hadn’t had a hunch, I’d have set it off.”

Captain Doyle clapped the old warrant officer on the shoulder. “Forget it, Larsen. You wouldn’t have hurt anybody; that’s why I require the pits to be evacuated even for small charges. These isotope explosives are tricky at best. Look what happened in pit A-9. Ten days’ work shot with one charge, and the gunnery officer himself approved that one. But I want to see this boy. What did you say his name was?”

“Libby, A. J.”

Doyle touched a button on his desk. A knock sounded at the door. A bellowed “Come in!” produced a stripling wearing the brassard of Corpsman Mate-of-the-Deck.

“Have Corpsman Libby report to me.”

“Aye aye, sir.”

Some few minutes later Libby was ushered into the Captain’s cabin. He looked nervously around, and noted Larsen’s presence, a fact that did not contribute to his peace of mind. He reported in a barely audible voice, “Corpsman Libby, sir.”

The Captain looked him over. “Well, Libby, I hear that you and Mr. Larsen had a difference of opinion this morning. Tell me about it.”

“I—I didn’t mean any harm, sir.”

“Of course not. You’re not in any trouble; you did us all a good turn this morning. Tell me, how did you know that the calculation was wrong? Had any mining experience?”

“No, sir. I just saw that he had worked it out wrong.”

“But how?”

Libby shuffled uneasily. “Well, sir, it just seemed wrong—It didn’t fit.”

“Just a second, Captain. May I ask this young man a couple of questions?” It was Commander “Blackie” Rhodes who spoke.

“Certainly. Go ahead.”

“Are you the lad they call ‘Pinkie’?”

Libby blushed. “Yes, sir.”

“I’ve heard some rumors about this boy.” Rhodes pushed his big frame out of his chair, went over to a bookshelf, and removed a thick volume. He thumbed through it, then with open book before him, started to question Libby.

“What’s the square root of ninety-five?”

“Nine and seven hundred forty-seven thousandths.”

“What’s the cube root?”

“Four and five hundred sixty-three thousandths.”

“What’s its logarithm?”

“Its what, sir?”

“Good Lord, can a boy get through school today without knowing?”

The boy’s discomfort became more intense. “I didn’t get much schooling, sir. My folks didn’t accept the Covenant until Pappy died, and we had to.”

“I see. A logarithm is a name for a power to which you raise a given number, called the base, to get the number whose logarithm it is. Is that clear?”

Libby thought hard. “I don’t quite get it, sir.”

“I’ll try again. If you raise ten to the second power—square it—it gives one hundred. Therefore the logarithm of a hundred to the base ten is two. In the same fashion the logarithm of a thousand to the base ten is three. Now what is the logarithm of ninety-five?”

Libby puzzled for a moment. “I can’t make it come out even. It’s a fraction.”

“That’s okay.”

“Then it’s one and nine hundred seventy-eight thousandths—just about.”

Rhodes turned to the Captain. “I guess that about proves it, sir.”

Doyle nodded thoughtfully. “Yes, the lad seems to have intuitive knowledge of arithmetical relationships. But let’s see what else he has.”

“I am afraid we’ll have to send him back to Earth to find out properly.”

Libby caught the gist of this last remark. “Please, sir, you aren’t going to send me home? Maw ’ud be awful vexed with me.”

“No, no, nothing of the sort. When your time is up, I want you to be checked over in the psychometrical laboratories. In the meantime I wouldn’t part with you for a quarter’s pay. I’d give up smoking first. But let’s see what else you can do.”

In the ensuing hour the Captain and the Navigator heard Libby: one, deduce the Pythagorean proposition; two, derive Newton’s laws of motion and Kepler’s laws of ballistics from a statement of the conditions in which they obtained; three, judge length, area, and volume by eye with no measurable error. He had jumped into the idea of relativity and non-rectilinear space-time continua, and was beginning to pour forth ideas faster than he could talk, when Doyle held up a hand.

“That’s enough, son. You’ll be getting a fever. You run along to bed now, and come see me in the morning. I’m taking you off field work.”

“Yes, sir.”

“By the way, what is your full name?”

“Andrew Jackson Libby, sir.”

“No, your folks wouldn’t have signed the Covenant. Good night.”

“Good night, sir.”

After he had gone, the two older men discussed their discovery.