Russ laughed. "You can if you want to. Greg and I are keeping on."

"We can't waste time," Manning said. "Spencer Chambers may get wind of

this. He'd move all hell to stop us."

Wilson spat out his cigarette. "Why don't you patent what you have? That

would protect you."

* * * * *

Russ grinned, but it was a sour one.

"No use," said Greg. "Chambers would tie us up in a mile of legal red

tape. It would be just like walking up and handing it to him."

"You guys go ahead and work," Wilson stated. "I'm taking a vacation.

Three months is too damn long to stay out in a spaceship."

"It doesn't seem long to me," said Greg, his tone cold and sharp.

No, thought Russ, it hadn't seemed long. Perhaps the hours had been

rough, the work hard, but he hadn't noticed. Sleep and food had come in

snatches. For three months they had worked in space, not daring to carry

out their experiments on Earth ... frankly afraid of the thing they had.

He glanced at Manning.

The three months had left no mark upon him, no hint of fatigue or

strain. Russ understood now how Manning had done the things he did. The

man was all steel and flame. Nothing could touch him.

"We still have a lot to do," said Manning.

Russ leaned back and puffed at his pipe.

Yes, there was a lot to do. Transmission problems, for instance. To

conduct away such terrific power as they knew they were capable of

developing would require copper or silver bars as thick as a man's

thigh, and even so at voltages capable of jumping a two-foot spark gap.

Obviously, a small machine such as they now had would be impractical. No

matter how perfectly it might be insulated, the atmosphere itself would

not be an insulator, with power such as this. And if one tried to

deliver the energy as a mechanical rotation of a shaft, what shaft could

transmit it safely and under control?

"Oh, hell," Russ burst out, "let's get back to Earth."

* * * * *

Harry Wilson watched the couple alight from the aero-taxi, walk up the

broad steps and pass through the magic portals of the Martian Club. He

could imagine what the club was like, the deference of the management,

the exotic atmosphere of the dining room, the excellence of the long,

cold drinks served at the bar. Mysterious drinks concocted of

ingredients harvested in the jungles of Venus, spiced with produce from

the irrigated gardens of Mars.

He puffed on the dangling cigarette and shuffled on along the airy

highwalk. Below and above him, all around him flowed the beauty and the

glamor, the bravery and the splendor of New York. The city's song was in

his ears, the surging noises that were its voice.

Two thousand feet above his head reared giant pinnacles of shining

metal, glinting in the noonday sun, architecture that bore the alien

stamp of other worlds.

Wilson turned around, stared at the Martian Club. A man needed money to

pass through those doors, to taste the drinks that slid across its bar,

to sit and watch its floor shows, to hear the music of its orchestras.

For a moment he stood, hesitating, as if he were trying to make up his

mind. He flipped away the cigarette, turned on his heel, walked briskly

to the automatic elevator which would take him to the lower levels.

There, on the third level, he entered a Mecho restaurant, sat down at a

table and ordered from the robot waiter, pushing ivory-tipped buttons on

the menu before him.

He ate leisurely, smoked ferociously, thinking. Looking at his watch, he

saw that it was nearly two o'clock. He walked to the cashier machine,

inserted the metallic check with the correct change and received from

the clicking, chuckling register the disk that would let him out the

door.

"Thank you, come again," the cashier-robot fluted.

"Don't mention it," growled Wilson.

Outside the restaurant he walked briskly. Ten blocks away he came to a

building roofing four square blocks. Over the massive doorway, set into

the beryllium steel, was a map of the Solar System, a map that served as

a cosmic clock, tracing the movement of the planets as they swung in

their long arcs around the Sun. The Solar System was straddled by

glowing, golden letters. They read: INTERPLANETARY BUILDING.

It was from here that Spencer Chambers ruled his empire built on power.

Wilson went inside.

_CHAPTER FOUR_

The new apparatus was set up, a machine that almost filled the

laboratory ... a giant, compact mass of heavy, solidly built metal work,

tied together by beams of girderlike construction. It was meant to stand

up under the hammering of unimaginable power, the stress of unknown

spatial factors.

Slowly, carefully, Russell Page tapped keys on the control board,

setting up an equation. Sucking thoughtfully at his pipe, he checked and

rechecked them.

Harry Wilson regarded him through squinted eyes.

"What the hell is going to happen now?" he asked.

"We'll have to wait and see," Russ answered. "We know what we want to

happen, what we hope will happen, but we never can be sure. We are

working with conditions that are entirely new."

Sitting beside a table littered with papers, staring at the gigantic

machine before him, Gregory Manning said slowly: "That thing simply has

to adapt itself to spaceship drive. There's everything there that's

needed for space propulsion. Unlimited power from a minimum of fuel.

Split-second efficiency. Entire independence of any set condition,

because the stuff creates its own conditions."

He slowly wagged his head.

"The secret is some place along the line," he declared. "I feel that we

must be getting close to it."

Russ walked from the control board to the table, picked up a sheaf of

papers and leafed through them. He selected a handful and shook them in

his fist.

"I thought I had it here," he said. "My math must have been wrong, some

factor that I didn't include in the equation."

"You'll keep finding factors for some time yet," Greg prophesied.

"Repulsion would have been the answer," said Russ bitterly. "And the

Lord knows we have it. Plenty of it."

"Too much," observed Wilson, smoke drooling from his nostrils.

"Not too much," corrected Greg. "Inefficient control. You jump at

conclusions, Wilson."

"The math didn't show that progressive action," said Russ. "It showed

repulsion, negative gravity that could be built up until it would shoot

the ship outside the Solar System within an hour's time. Faster than

light. We don't know how many times faster."

"Forget it," advised Greg. "The way it stands, it's useless. You get

repulsion by progressive steps. A series of squares with one constant

factor. It wouldn't be any good for space travel. Imagine trying to use

it on a spaceship. You'd start with a terrific jolt. The acceleration

would fade and just when you were recovering from the first jolt, you'd

get a second one and that second one would iron you out. A spaceship

couldn't take it, let alone a human body."

* * * * *

"Maybe this will do it," said Wilson hopefully.

"Maybe," agreed Russ. "Anyhow we'll try it. Equation 578."

"It might do the trick," said Greg. "It's a new approach to the gravity

angle. The equation explains the shifting of gravitational lines, the

changing and contortion of their direction. Twist gravity and you have a

perfect space drive. As good as negative gravity. Better, perhaps, more

easily controlled. Would make for more delicate, precise handling."

Russ laid down the sheaf of papers, lit his pipe and walked to the

apparatus.

"Here goes," he said.

His hand went out to the power lever, eased it in. With a roar the

material energy engine built within the apparatus surged into action,

sending a flow of power through the massive leads. The thunder mounted

in the room. The laboratory seemed to shudder with the impact.

Wilson, watching intently, cried out, a brief, choked-off cry. A wave of

dizziness engulfed him. The walls seemed to be falling in. The room and

the machine were blurring. Russ, at the controls, seemed horribly

disjointed. Manning was a caricature of a man, a weird, strange figure

that moved and gestured in the mad room.

Wilson fought against the dizziness. He tried to take a step and the

floor seemed to leap up and meet his outstretched foot, throwing him off

balance. His cigarette fell out of his mouth, rolled along the floor.

Russ was shouting something, but the words were distorted, loud one

instant, rising over the din of the apparatus, a mere whisper the next.

They made no sense.

There was a peculiar whistling in the air, a sound such as he had never

heard before. It seemed to come from far away, a high, thin shriek that

was torture in one's ears.

Giddy, seized with deathly nausea, Wilson clawed his way across the

floor, swung open the laboratory door and stumbled outdoors. He weaved

across the lawn and clung to a sun dial, panting.

He looked back at the laboratory and gasped in disbelief. All the trees

were bent toward the building, as if held by some mighty wind. Their

branches straining, every single leaf standing at rigid attention, the

trees were bending in toward the structure. _But there was no wind._

And then he noticed something else. No matter where the trees stood, no

matter in what direction from the laboratory, they all bent inward

toward the building ... and the whining, thundering, shrieking machine.

Inside the laboratory an empty bottle crashed off a table and smashed

into a thousand fragments. The tinkling of the broken glass was a

silvery, momentary sound that protested against the blasting thrum of

power that shook the walls.

Manning fought along the floor to Russ's side. Russ roared in his ear:

"Gravitational control! Concentration of gravitational lines!"

The papers on the desk started to slide, slithering onto the floor,

danced a crazy dervish across the room. Liquids in the laboratory

bottles were climbing the sides of glass, instead of lying at rest

parallel with the floor. A chair skated, bucking and tipping crazily,

toward the door.

* * * * *

Russ jerked the power lever back to zero. The power hum died. The

liquids slid back to their natural level, the chair tipped over and lay

still, papers fluttered gently downward.

The two men looked at one another across the few feet of floor space

between them. Russ wiped beads of perspiration from his forehead with

his shirt sleeve. He sucked on his pipe, but it was dead.

"Greg," Russ said jubilantly, "we have something better than

anti-gravity! We have something you might call _positive_ gravity ...

gravity that we can control. Your grandfather nullified gravity. We've

gone him one better."

Greg gestured toward the machine. "You created an attraction center.

What else?"

"But the center itself is not actually an attracting force. The fourth

dimension is mixed up in this. We have a sort of fourth-dimensional lens

that concentrates the lines of any gravitational force. Concentration in

the fourth dimension turns the force loose in three dimensions, but we

can take care of that by using mirrors of our anti-entropy. We can

arrange it so that it turns the force loose in only one dimension."

Greg was thoughtful for a moment. "We can guide a ship by a series of

lenses," he declared at last. "But here's the really important thing.

That field concentrates the forces of gravity already present. Those

forces exist throughout all of space. There are gravitational lines

everywhere. We can concentrate them in any direction we want to. In

reality, we fall toward the body which originally caused the force of

gravitation, not to the concentration."

* * * * *

Russ nodded. "That means we can create a field immediately ahead of the

ship. The ship would fall into it constantly, with the concentration

moving on ahead. The field would tend to break down in proportion to the

strain imposed and a big ship, especially when you are building up

speed, would tend to enlarge it, open it up. But the field could be kept

tight by supplying energy and we have plenty of that ... far more than

we'd ever need. We supply the energy, but that's only a small part of

it. The body emitting the gravitational force supplies the fulcrum that

moves us along."

"It would operate beyond the planets," said Greg. "It would operate

equally well anywhere in space, for all of space is filled with

gravitational stress. We could use gravitational bodies many light years

away as the driver of our ships."

A half-wild light glowed momentarily in his eyes.

"Russ," he said, "we're going to put space fields to work at last."

He walked to the chair, picked it up and sat down in it.

"We'll start building a ship," he stated, "just as soon as we know the

mechanics of this gravity concentration and control. Russ, we'll build

the greatest ship, the fastest ship, the most powerful ship the Solar

System has ever known!"

* * * * *

"Damn," said Russ, "that thing's slipped again."

He glared at the offending nut. "I'll put a lock washer on it this

time."

Wilson stepped toward the control board. From his perch on the

apparatus, Russ motioned him away.

"Never mind discharging the field," he said. "I can get around it

somehow."

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