The Sky Is Falling Part 11

"Dave Hanson, world saver! You got the right name but the wrong man, Sather Karf," he said bitterly. He'd been a pretender long enough, and what punitive action they took now didn't seem to matter. "You wanted my uncle, David Arnold Hanson. But because his friends called him Dave and cut that name on his monument, and because I was christened by the name you called, you got me instead. He'd have been helpless here, probably, but with me you have no chance. I couldn't even build a doghouse. I wasn't even a construction engineer. Just a computer operator and repairman."

He regretted ruining their hopes, almost as he said it. But he could see no change on the old Sather's face. It seemed to stiffen slightly and become more thoughtful, but there was no disappointment.

"My grandson Bork told me all that," he said. "Yet your name was on the monument, and we drew you back by its use. Our ancient prophecy declared that we should find omnipotence carved on stone in a pool of water, as we found your name. Therefore, by the laws of rational magic, it is _you_ to whom nothing is impossible. We may have mistaken the direction of your talent, but nonetheless it is you who must fix the sky. What form of wonder is a computer?"

Dave shook his head at the old man's monomania. "Just a tool. It's a little hard to explain, and it couldn't help."

"Humor my curiosity, then. What is a computer, Dave Hanson?"

Nema's hand rested on Hanson's arm pleadingly, and he shrugged. He groped about for some answer that could be phrased in their language, letting his mind flicker from the modern electronic gadgets back to the old-time tide predicter.

"An a.n.a.logue computer is a machine that ... that sets up conditions mathematically similar to the conditions in some problem and then lets all the operations proceed while it draws a graph--a prediction--of how the real conditions would turn out. If the tides change with the position of some heavenly body, then we can build cams that have shapes like the effect of the moon's...o...b..t, and gear them together in the right order. If there are many factors, we have a cam for each factor, shaped like the periodic rise and fall of that factor. They're all geared to let the various factors operate at the proper relative rate. With such a machine, we can run off a graph of the tides for years ahead. Oh, h.e.l.l--it's a lot more complicated than that, but it takes the basic facts and draws a picture of the results. We use electronic ones now, but the results are the same."

"I understand," Sather Karf said. Dave doubted it, but he was happy to be saved from struggling with a more detailed explanation. And maybe the old man did understand some of it. He was no fool in his own subject, certainly. Sather Karf pondered for a moment, and then nodded with apparent satisfaction. "Your world was more advanced in understanding than I had thought. This computer is a fine scientific instrument, obeying natural law well. We have applied the same methods, though less elaborately. But the basic magical principle of similarity is the foundation of true science."

Dave started to protest, and then stopped, frowning. In a way, what the other had said was true. Maybe there was some relation between science and magic, after all; there might even be a meeting ground between the laws of the two worlds he knew. Computers set up similar conditions, with the idea that the results would apply to the original. Magic used some symbolic part of a thing in manipulations that were to be effective for the real thing. The essential difference was that science was predictive and magic was effective--though the end results were often the same. On Dave's world, the cardinal rule of logic was that the symbol was not the thing--and work done on symbols had to be translated by hard work into reality. Maybe things were really more logical here where the symbol was the thing, and all the steps in between thought and result were saved.

"So we are all at fault," Sather Karf said finally. "We should have studied you more deeply and you should have been more honest with us.

Then we could have obtained a computer for you and you could have simulated our sky as it should be within your computer and forced it to be repaired long ago. But there's no time for regrets now. We cannot help you, so you must help yourself. Build a computer, Dave Hanson!"

"It's impossible."

Sudden rage burned on the old man's face, and he came to his feet. His arm jerked back and snapped forward. Nothing happened. He grimaced at the ruined sky. "Dave Hanson," he cried sharply, "by the unfailing power of your name which is all of you, I hold you in my mind and your throat is in my hand--"

The old hands squeezed suddenly, and Hanson felt a vise clamp down around his throat. He tried to break free, but there was no escape. The old man mumbled, and the vise was gone, but something clawed at Hanson's liver. Something else rasped across his sciatic nerve. His kidneys seemed to be wrenched out of him.

"You will build a computer," Sather Karf ordered. "And you _will_ save our world!"

Hanson staggered from the shock of the pain, but he was no longer unused to agony. He had spent too many hours under the baking of the sun, the agony of the snetha-knife and the lash of an overseer's whip. The agony could not be stopped, but he'd learned it could be endured. His fantastic body could heal itself against whatever they did to him, and his mind refused to accept the torture supinely. He took a step toward Sather Karf, and another. His hands came up as he moved forward.

Bork laughed suddenly. "Let up, Sather Karf, or you'll regret it. By the laws, you're dealing with a _man_ this time. Let up, or I'll free him to meet you fairly."

The old man's eyes blazed hotly. Then he sighed and relaxed. The clutching hands and the pain were gone from Hanson as the Sather Karf slumped back wearily to his seat.

"Fix our sky," the old man said woodenly.

Hanson staggered back, panting from his efforts. But he nodded. "All right," he agreed. "Like Bork, I think a man has to fight against his fate, no matter how little chance he has. I'll do what I can. I'll build the d.a.m.ned computer. But when I'm finished, I'll wait for _your_ true name!"

Suddenly Sather Karf laughed. "Well said, Dave Hanson. You'll have my name when the time comes. And whatever else you desire. Also what poor help we can give you now. Ser Perth, bring food for Dave Hanson!"

Ser Perth shook his head sadly. "There is none. None at all. We hoped that the remaining planets would find a favorable conjunction, but--"

Dave Hanson studied his helpers with more bitterness. "Oh, h.e.l.l!" he said at last. He snapped his fingers. "Abracadabra!"

His skill must be improving, since he got exactly what he had wished for. A full side of beef materialized against his palm, almost breaking his arm before he could snap it out of the way. The others swarmed hungrily toward it. At their expressions of wonder, Hanson felt more confidence returning to him. He concentrated and went through the little ritual again. This time loaves of bread rained down--fresh bread, and even of the brand he had wished for. Maybe he was becoming a magician himself, with a new magic that might still accomplish something.

Sather Karf smiled approvingly. "The theory of resonance, I see.

Unreliable generally. More of an art than a science. But you show promise of remarkable natural ability to apply it."

"You know about it?" Dave had a.s.sumed that it was completely outside their experience and procedures.

"We _knew_ it. But when more advanced techniques took over, most of us forgot it. The syllables resonate in a sound pattern with your world, to which you also still resonate. It won't work for you with anything from this world, nor will anything work thus for us from yours. We had different syllables, of course, for use here." Sather Karf considered it. "But if you can control it and bring in one of your computers or the parts for one--"

Sixteen tries later, Dave was cursing as he stared at a pile of useless items. He'd gotten transistors at first. Then he lost control with too much tension or fatigue and began getting a bunch of a.s.sorted junk, such as old 201-A tubes, a transit, a crystal vase and resistors. But the chief trouble was that he couldn't secure working batteries. He had managed a few, but all were dead.

"Like the soul, electrical charges will not transfer," Sather Karf agreed sadly. "I should have told you that."

There was no electricity here with which to power anything, and their spells could not be made to work now. Even if he could build a computer out of what was obtainable, there would be no way to power it.

Overhead, the sky shattered with a roar, and another piece fell, tearing downwards toward the city. Sersa Garm stared upwards in horror.

"Mars!" he croaked. "Mars has fallen. Now can there be no conjunction ever!"

He tautened and his body rose slowly from the ground. A scream ripped from his lips and faded away as he began rushing upwards with increasing speed. He pa.s.sed but of their sight, straight toward the new hole in the sky.

IX

In the hours that followed, Dave's vague plans changed a dozen times as he found each idea unworkable. His emotional balance was also erratic--though that was natural, since the stars were completely berserk in what was left of the sky. He seemed to fluctuate between bitter sureness of doom and a stupidly optimistic belief that something could be done to avert that doom. But whatever his mood, he went on working and scheming furiously. Maybe it was the desperate need to keep himself occupied that drove him, or perhaps it was the pleading he saw in the eyes around him. In the end, determination conquered his pessimism.

Somewhere in the combination of the science he had learned in his own world and the technique of magic that applied here there had to be an answer--or a means to hold back the end of the world until an answer could be found.

The biggest problem was the number of factors with which he had to deal.

There were seven planets and the sun, and three thousand fixed stars.

All had to be ordered in their courses, and the sky had to be complete in his calculations.

He had learned his trade where the answer was always to add one more circuit in increasing complexity. Now he had to think of the simplest possible similarity computer. Electronics was out, obviously. He tried to design a set of cams, like the tide machine, to make multiple tracings on paper similar to a continuous horoscope, but finally gave it up. They couldn't build the parts, even if there had been time.

He had to depend on what was available, since magic couldn't produce any needed device and since the people here had depended on magic too long to develop the other necessary skills. When only the broadest powers of magic remained, they were hopeless. Names were still potent, resonance worked within its limits, and the general principles of similarity still applied; but those were not enough for them. They depended too heavily on the second great principle of contagion, and that seemed to be wrapped up with some kind of a.s.sociation through the signs and houses and the courses of the planets.

He found himself thinking in circles of worry and pulled himself back to his problem. Normally, a computer was designed for flexibility and to handle varying conditions. This one could be designed to handle only one set of factors. It had to duplicate the courses of the objects in their sky and simulate the general behavior of the dome. It was not necessary to allow for all theoretical courses, but only for the normal orbits.

And finally he realized that he was thinking of a model--the one thing which is functionally the perfect a.n.a.logue.

It brought him back to magic again. Make a doll like a man and stick pins in it--and the man dies. Make a model of the universe within the sky, and any changes in that should change reality. The symbol was the thing, and a model was obviously a symbol.

He began trying to plan a model with three thousand stars in their orbits, trying to find some simple way of moving them. The others watched in fascination. They apparently felt that the diagrams he was drawing were some kind of scientific spell. Ser Perth was closer than the others, studying the marks he made. The man suddenly pointed to his computations.

"Over and over I find the figure seven and the figure three thousand. I a.s.sume that the seven represents the planets. But what is the other figure?"

"The stars," Hanson told him impatiently.

Ser Perth shook his head. "That is wrong. There were only two thousand seven hundred and eighty-one before the beginnings of our trouble."

"And I suppose you've got the exact orbits of every one?" Hanson asked.

He couldn't see that the difference was going to help much.