Smitty shook his head. "Those jets don't even _sound_ right, Bill--"

"I know," Morrow said. He sighed wearily. "We've got to do better than

this. Take her higher--ram-jets are supposed to work better at high

altitude."

"I don't want to go over twelve thousand without oxygen," Smitty

replied. "Can't let this wind blow us down over Yosemite National Park,

either--if we can help it."

"Take her up," Morrow said.

The ship continued to rise, steadily.

"Eleven thousand," Smitty chanted. "Eleven thousand five hundred,

twelve thousand, twelve thousand five--she's flattening out!"

Their ascent slowed, gradually. The ship steadied at thirteen thousand

feet above sea-level--7500 feet on the altimeter, which had been zeroed

to the altitude of their sawmill workshop.

"Down!" Morrow barked. "She's losing speed!"

The indicator needle was creeping back past thirty-five, then

thirty--their sideward shift to the south could be felt. Smitty shoved

forward his control wheel. The ship dived.

They glided easily back across the mountain slope toward their sawmill.

Judging their wind-drift accurately, Smitty set the ship down in the

yard before the black, yawning doors of the building. As the runners

scraped the ground, he switched off the gravitors and slumped back in

his seat, dejectedly.

"We've got to rebuild that jet chamber," he muttered. "There's

something wrong with it, Bill. All we've got is a big wind-blower, in

spite of her weightlessness--the drag of the hull wouldn't slow us down

_that_ much!"

Morrow unbuckled his seat-belt, rose, and strode back to the steps

without a word.

It took them a week to pull out the rear bulk-heads and completely

redesign and reconstruct the tail-jet assembly. When they finished,

they tried it again. They got an air-speed of seventy m.p.h. at low

level, but it dropped to twenty m.p.h. as they gained altitude. The

tail-jets didn't just make a whooming sound, this time--they made a

rumbling, burbling sound.

They landed and pulled the ship into the workshop, closing the big

doors after it. Morrow walked over to the workbench, pulled off his

gloves, and threw them down.

"It's no good!" he said harshly. "That jet chamber just isn't shaped

right--there's too much turbulence in it, breaks up the jet-blast."

"We'll rebuild it again," Smitty said, with a shrug in his voice.

Morrow wheeled and glared at him, red-eyed. "We aren't jet engineers,

Smitty. We're building by guesswork! We can redesign that jet chamber a

thousand times and never get the right shape!"

Smitty moved on to the stove and began stoking up the red coals,

stacking wood on them. "She does seventy per hour up to seven thousand

feet," he said dully. "If that's the best we can do, we'll just have to

be satisfied with it."

"It's not _good_ enough!" Morrow protested. "She _has_ to have more

speed, Smitty. She'll be at the mercy of every wind that comes along if

she hasn't, weightless as she is!" He smacked his fist into his palm,

decisively. "We've got to get help, chum."

"Help?" Smitty turned and looked at him, querulously. "Where can we get

help?"

"A jet engineer," Morrow snapped irritably. "That's the only one

who _can_ help us. We've got to find one--" He broke off, suddenly

thoughtful.

Smitty grinned without mirth, mistaking his silence for hopelessness.

"That's the trouble, Bill," he said. "There's no one who _would_ help

us!"

"I'm not so sure about that!" Morrow replied softly. "_I'm not so sure

at all--_"

* * * * *

It was late Friday afternoon when Morrow parked the battered,

mud-splattered truck on a side-street and climbed out to go for a quiet

stroll in suburban Sacramento.

The street address he was looking for turned up in the next block, near

the edge of town. It was an inconspicuous one of the long street-row

of small houses with a green lawn stretching down to the curb and

dotted with a few evergreen shrubs, a broad livingroom picture window

in front, a white front door with a small ornamental iron night-lamp

mounted above it, and a one-story, red-tiled roof in the flat, gently

sloping California style.

Morrow walked past the house and around the block to the alley. He

walked up the alley behind the house. Its rear was as inconspicuous as

its front: a wide yard, partly in lawn, partly in flower garden and

part gravelled with clothesline, enclosed by a low, whitewashed wood

fence. The only noticeable difference was a small sand-box in which a

small brother and sister were playing with toy cars. The little boy and

girl wore matching rompers and had straw-colored hair which, Morrow

concluded, they must have inherited from their mother. He'd never met

Mrs. Foster, but he remembered Bob Foster's dark, heavy hair.

He walked on down the alley, studying the back yards behind the other

houses. He noted how wide the alleyway was, how high surrounding

fences, garages, and other obstructions were, and the lack of telephone

poles or wires overhead. He nodded his satisfaction.

When he got back to the truck, he took a street-map from the glove

compartment and carefully marked the exact location of Foster's house.

Then he drove out of Sacramento, had dinner at a roadside restaurant,

and proceeded to Stockton. Smitty met him downtown and they went into a

lunchroom for coffee.

"Groceries and laundry's taken care of," Smitty reported wryly. "How

was Sacramento?"

"Fine," Morrow said. "If the weather forecasts for tomorrow night pan

out, we'll get in and out without any trouble."

Smitty frowned worriedly. "It's still a big risk to take, Bill. We'll

be flying into the Coastal Radar-Defense Zone, you know, and we can't

just file a flight-plan at an airport for an unauthorized, illegal

ship. I'd hate to look up and see an F-140 night-fighter with its

nose-cannon blazing at me!"

"That ground radar isn't effective below three thousand feet," Morrow

reminded him. "I think we can sneak in at treetop-level without being

detected."

"That's all right, unless we fly into a power-line in the dark," Smitty

grumbled. "It's still risky as hell--"

"We've got to have Foster," Morrow said firmly. "I can't say for sure

whether he'll join us or not, but we've got to try!"

"Okay!" Smitty signed resignedly. "We'll try."

The following night, Morrow left Smitty checking over their ship and

flight equipment and drove the truck down to a gas station on the

highway, thirty miles west of their sawmill-workshop. He parked beside

the gas pumps, told the attendant to fill the tank and check the oil,

and went inside to the pay-phone booth.

He called Sacramento Long Distance and gave them Foster's home

videophone number.

There was some fault in calling from a pay-phone, of course--and

a Long Distance call on a rural pay-phone at that. Neither Long

Distance calls nor pay-phones nor rural phones had the new videophone

accessories. Videophones, involving two-way television transmission via

a camera-screen installation, were still in the development stage.

Metropolitan and suburban phones had the video screens. Long Distance

coaxial transmission was still too costly to merit the installation of

the screens on rural phones--which also ruled out Long Distance video

calls. To install the screens in pay-phones would, as yet, triple the

cost of the calls.

Naturally, the Sacramento operator would inform Foster this was a Long

Distance call; Foster's screen would remain blank. The gas station's

pay-phone had no screen. This was a disadvantage to Morrow: not seeing

Foster's face, he wouldn't be absolutely certain he was speaking to

Foster. He'd have to rely on his memory of Foster's voice, and it had

been more than two years since he'd met Foster.

Positive identification could be important. Morrow kicked himself

mentally for not making a local call to Foster's home while he was in

Sacramento. Suppose Foster had moved in the past two years? Suppose

there was some sort of slip-up that aroused someone's suspicions just

enough to start the authorities on an investigation--

Even the _slightest_ mistake might finish them!

And the call had to be made. Their plan was set for tonight, Saturday

night, because Foster was most likely to be home from work--research

engineers often worked late hours on weekdays--and because he'd

probably have the next day off. They had to get Foster out for that

one day, and it had to be done right. But they had to be certain that

Foster was home when they went after him.

The receiver continued its rattling noise in his ear as Morrow waited,

fidgeting impatiently, and the seconds crawled past.

The rattling ended with a faint click.

"_Hello?_"

Morrow exhaled a shuddery sigh of relief. He recognized Foster's

characteristic deep, muffled tones almost at once. "Hi, Bob. This is

Bill Morrow--"

"_Morrow? Well, hi yourself! Where you calling from?_"

"I'm on the highway," Morrow said. "I'm on my way north and wondered if

I might drop in as I pass through Sacramento--I ought to be there in a

few hours. You going to be home?"

"_Ye-e-es. C'mon around, by all means! You still have my home address,

haven't you?_"

"Sure thing. How've you been?"

"_So-so, between drawing curves on flight-test characteristics and

pounding out stories. You written anything lately?_"

"I've been a little too busy to give it much thought," Morrow answered

truthfully.

"_Uh huh! Well--say, you going to be in 'Frisco for next year's

science-fiction convention?_"

Morrow grinned. "'Sa little too early to say, yet. I'll see you in a

few hours, then, huh?"

"_Right-o! We'll have the beer on ice!_"

* * * * *

Morrow drove back to the sawmill workshop and helped Smitty perform

a final inspection of the ship and equipment. Their plan was

worked out thoroughly. The ship would fly to and from their target

at low altitude, and at its maximum speed. The forecast weather

conditions would aid in hiding them, but it would also hinder their

flight--much of it would have to be done on instruments, and Smitty

spent considerable time studying topographical sector-maps and radio

omni-range vectors.

Their personal gear consisted of two special suits which would serve to

conceal their identity as well as aid them in an emergency. The suits,

patterned out of shimmering fabrilastex material, fit with skin-tight

snugness over their long winter underwear and socks. The foot-soles of

the suits were of springy foam-rubber, heat-welded to the fabrilastex

just as the seams in the material were heat-welded to a perfect fit.

A sturdy harness fitted into the inside of the suits to grip their

legs, thighs, and chests, suspending them in bail-outs from the sturdy

plastic tanks on the back of their suits. Each tank enclosed a gravitor

unit. A lightweight, transparent blue dome helmet fitted over their

heads and clamped onto fasteners on their shoulders. There were small

air-vents around the bottom of the helmets and in the fantastic-looking

knob attachments in their tops.

They pulled on their suits in the workshop and stared at each other,

grinning. "All you need," Smitty taunted, "is a flashlight ray-gun in

each hand!"

"You look pretty monstrous yourself, blue-face!" Morrow retorted.

"_You_ look _sexy_, old boy!"

"_Down_, Rover! Better climb on the ship's radio and check the weather

reports again--"

"Wilco!"

Morrow walked to the end of the workshop and swung open the big doors.

Then he went back and crawled into the ship, swinging the thick

"air-lock" door into its grooves behind him. As he climbed into the

control pit, Smitty reported that the weather was just as lousy as

they wanted it to be: clear, cold, and windy at high altitudes, with

some low cumulus and a five-hundred-foot thick blanket of fog hugging

the ground and creeping in and out of the valleys. There were several

scattered thunder-showers and by morning there would be solid rain in

the mountains.

Morrow switched on the gravitor units at the flight engineer's panel,

then moved up and strapped himself into the co-pilot's seat. "It's your

bus, Junior," he said. "Let me know when we reach my stop."

"Passengers move to the rear, please," Smitty retorted, and eased the

ship cautiously out of the workshop. They swung northward and set off,

flying just a few hundred feet above the mountain slopes. The moon was

a cold, white gash in the black heavens, and the dark mantle of the

treetops swept past below.

Unfastening his helmet, Morrow swung it back and relaxed, lighting a

cigarette....

* * * * *

They had to use every precaution in going after Foster. In the first

place, they had to consider that he might be violently opposed to their

project--that, in fact, he might go straight to the authorities with

it. The only safeguard against that was simply to prevent Foster from

knowing where their project was located. Without that information, he

would probably find it difficult to make the authorities believe him. A

mere story about mechanisms that control gravity, without any basis of

fact to support it, would sound rather far-fetched.

For that matter, it would have been difficult merely to visit Foster

and convince him they did have such mechanisms! The only quick answer

was to show him, to prove it to him. Then he would listen to them.

There was a good chance that he'd approve of their project and help

them with it--otherwise, Morrow wouldn't have thought of him. And

he was a man who could help them. Robert Foster was a jet engineer,

employed as a flight-test analyst at an aircraft corporation's

experimental plant near Sacramento. Morrow had met him, however,

because Foster had written many stories for the science-fiction

magazines, mostly on the galactic empire theme. They had met at a

private science-fiction club in New York and spent most of a long

night in a bar, along with several other writers and magazine

editors, discussing subjects of vast scope and consuming beverages in

vast quantity. Foster had proved himself a kindred soul of fertile

imagination, if not of superior intellect, and so into the wee, small

hours.

In short, Foster had impressed him as a man to be trusted when the

going got rough.

Whether or not that impression had been correct, Morrow didn't know.

Tonight would certainly put it to the test. They could only ask for his

help, and that was all. If he refused, he refused. They couldn't use

threats or coercion or any suggestion of violence--that would gain them

nothing.

Foster _had_ to agree! There was no one else! Without his help, they

were stymied....

The weather thickened as they turned west, coming down off the slopes

of the Sierras. Silvery masses of cloud drifted by in the moonlight

and a thin, gray haze obscured the ground. They cruised along, their

tail-jets rumbling, descending slowly to pass beneath a long row of

clouds ahead. Raindrops began streaking the transparent blister which

pinged at their impact; then it began a steady, ringing sound as

the downpour increased. The world was turned into a gray, trickling

wetness, faintly reflecting the green glow of the luminous instrument

dials. The lights of a town appeared off to the left, wavering sparks

in the wet gloom. Smitty swore under his breath.

They emerged from the shower to find themselves over an endless mass

of cottony white, completely hiding the ground. "Now we gotta go down

through that stuff!" Smitty muttered, and pushed the nose down.

The ground became dimly visible through the mist at a height of seventy

feet. "Airspeed's a hundred and ten; headwind was reported at twenty

miles." Smitty chanted glumly.

Morrow said nothing for a moment, knowing Smitty meant that if they

were flying any faster their dim, wavering view of the ground would

mean nothing. Then he started and looked up. "A hundred and ten? In a

twenty-mile wind? That's ninety miles an hour!"

Smitty stared at his instruments and nodded slowly. "We're doing better

than we did," he agreed. "Either that, or this wind has twisted its

tail. We'll check it again."

They flew onward through the swirling, dark mist. The dark blurs of

trees flashed past below, and houses, roads, and telephone lines. Dim,

shadowy objects, hardly recognizable. And there were moments when the

mist closed in completely, hiding everything. Morrow felt a cold sweat

forming on his face. The jets made a deep, mournful rumbling sound

in the ship's tail. A highway swept past below, with car headlights

revealed as moving blobs of yellow in the darkness.

"This is the block," Morrow said, finally. "Swing across it and come

down in that alleyway in its center. I'll tell you where to land then."

Below them were the familiar rooftops of the houses, rising darkly out

of a thin ground mist. Smitty brought the ship over them, cutting the

jets, and let it coast to a stop over the narrow, vague band of the

alleyway. Slowly, they drifted downward.

Morrow consulted the street-map on his lap again. "Up a little

further," he directed.

The jets gave a brief, rumbling sigh and they glided forward.

"Here--ground her!"

Gravel rasped against the ship's belly. They unfastened their belts and

scrambled down into the ship.

"What time is it?" Smitty whispered, as Morrow swung open the door.

Morrow glanced at his wrist-watch. "Three-ten a.m.," he said

half-humorously. He wondered if Foster was still waiting up for him.

"Fasten your helmet down, and let's go!"

They dropped down from the ship and went over to the low, white fence

behind Foster's house. Passing through the gate, they strode across

the yard. The mist-shine glimmered faintly off their bodies. Their

blue-tinted helmets were grotesque globes of darkness, like the heads

of nightmare creatures.

Light glowed from a window in the side of the house. "Somebody's up!"

Morrow observed softly.

"Do we go 'round and ring the front doorbell?" Smitty wondered. "Or do

we just walk in?"

Morrow shrugged. "It won't make much difference. Let's try the back

door--if it's locked, well go around."

They reached the door and he tested its knob, careful not to make any

noise. It yielded readily.

They entered.

The faint light filtering down the short hallway was enough to guide

them across the dark kitchen. Then they had to pass the dark doorways

of what were probably two bedrooms, on either side of the hall. They

reached the lighted doorway near the front, and stood looking into the

living room.

Robert Foster was seated in a comfortable chair next to the television

set. A single reading lamp was burning--the pipe clutched in Foster's

teeth was out--and he seemed deeply engrossed in a good book.

Morrow reached up and snapped the fasteners on his helmet.

Foster lifted his gaze with the utmost casualness and studied the two

figures in the doorway. He looked quite happy and contented, dressed

in an old pair of slacks and loafers and a turtle-neck sweater. His

dark, touselled hair showed evidence of his hand running through it--a

habitual gesture of his, Morrow remembered.

Slowly, a stunned expression crept across his face.

Morrow swung his helmet back onto his gravitor tank. "Hello, Bob," he

said.

Foster slipped a marker into his book, closed it, and laid it carefully

aside. "Morrow?" he said. "So you finally made it! I might've known

you'd be coming by way of Jupiter--but why the get-up, friend? And

who's your partner?" There was just the slightest quaver in his voice.

It was almost more than Morrow had hoped for. He could play it through,

now. "This is a Martian friend of mine," he said, hooking his thumb

toward Smitty. "I can't stay long. Somebody might see our spaceship and

get curious."

"Your--spaceship?" Foster queried falteringly.

"We landed it out in back."

The room was silent for a moment. Foster sat dumbfounded, staring at

them. A flicker of a gleam began to show itself in his eyes. "Am I to

understand," he said gently, "that you have landed a spaceship in my

back yard?"

"No," Morrow corrected. "In the alley."

"Hmmm--it'd better be in the alley. My wife would slaughter us both if

you'd trampled her gardenias." Foster fell back in his chair. He tried

to relax; he even grinned, somewhat shakily. "Now what's the idea,

Bill? Why'd you come tippy-toe in here like this? Out with it!"

"Take too long to explain," Morrow replied, shaking his head.

"Somebody's liable to see that spaceship any minute, now." He forced a

broad, innocent grin across his face. "You want to come have a look at

it?"

"Ye-e-es!" Foster agreed sarcastically, rising from his chair. "I

suppose I _should_ take a look at it--"

Morrow led him out the front door and around the house. "Don't want to

awaken your wife," he explained, clamping down his helmet.

"No-o-o-o!" Foster conceded. "I wouldn't advise that!" They proceeded

on across the back yard, through the clinging, wet fingers of the mist.

Then Foster saw the ship.

After that, it wasn't too hard to persuade him to enter it. Then it

was simple to switch on the gravitors and rise into the dark sky.

Morrow had him planted in the flight engineer's seat, enthusiastically

demanding explanations in full, as Smitty piloted them swiftly homeward.

Foster was sold!

* * * * *

They held a conference in the sawmill-workshop that lasted all the next

day and well into the next night. Then Foster went home to tell his

wife he'd had a hurry-up call from the aircraft plant and gone there to

work on some secret research; they drove him back to Sacramento in the

truck, and let him off near his house.

Then they returned to the workshop and went to work.

The following weekend, Foster drove up in his own car to see them. He

climbed out of his car wearing lace-boots and hunting clothes. Reaching

into the back seat, he brought out a shotgun and a stack of newspapers,

then Morrow came up to greet him and they strode into the workshop.

"You fellows have really been hitting the ball!" Foster exclaimed, as

he stopped and gazed at the small, needle-nosed ship sitting beside the

larger ship.

Morrow nodded. They had worked night and day to construct the second,

smaller ship--a little two-passenger job with sweptback fins and a

canopy-covered cockpit in its sharp nose. It rested neatly on its

long A-fins, poised to hurtle into the sky. Its color scheme--dark

blue-black on top, light gray on its belly--stood out in sharp contrast

to the solid, shimmering black of the giant ship behind it.

It had been Foster's idea. He'd pointed out to them that they needed a

smaller experimental model, easier to dismantle and rebuild, for the

development of their air-jet chamber.

"Have you given it a test-flight yet?" Foster asked.

"Ran it out last night," Smitty replied, coming around the two ships

to meet them. He set a plumber's blowtorch on the workbench and wiped

his hands on a rag. "It hit seventy miles an hour, then worked up to

seventy-four after a five-hour run."

Foster shook his head in puzzlement. "That's something I just can't

account for. A jet-pod ought to be just as efficient as its design,

and nothing should alter its basic performance other than a change in

atmospheric conditions."

"There was no atmospheric change," Morrow said. "Same altitude, same

barometric pressure, same thermal conditions. I'm beginning to think

the problem isn't only in the jet-pod design."

"That makes two of us!" Foster agreed. "The design I gave you should've

worked better than any seventy miles an hour, if your propulsion

unit develops that focus of 'false gravity' and squeezes the air out,

forming a low-pressure center, as you said it did."

"We've checked that, too," Morrow said, frowning thoughtfully. "I'm

beginning to think it's something to do with the gravitors' field of

influence. Come over here--I want to show you something!"

He led the jet engineer over to where he and Smitty had rigged a

gravitor mechanism and a sling-load of sandbags with rope attached,

just as they'd used in weight-testing the gravitors. He switched on the

gravitor, adjusted its setting, and let it lift the load of sandbags

into the air. Then he pointed to the rope dangling down beneath it.

"See that twist in the rope, just under the sandbags?" he said. "That

much of the rope is in the influence of the gravitor's field, which is

cancelling out the pull of the Earth's gravity. Now then, if it can

influence that three-foot length of rope, what influence might it have

on the air around it--and on the slipstream of air flowing over our

ships, which is supposed to enter the air-vents and be blasted out the

jets for propulsion of the ships?"

"It could be scrambling our intake flow," Foster acknowledged

pensively. "But would that condition alter in time?"

Morrow shook his head. "I don't think it does--or that it would unless

the gravitor's batteries were almost burned out. Then the field's

influence might lessen a bit. Otherwise, no."

"Then why is it that the jets' efficiency increases with time?" Foster

asked. "How'd you get seventy miles an hour on the big ship, then

ninety? And five hours' running built up the little ship's speed an

additional four miles per hour, didn't it?"

Smitty nodded. "It gets gradually better--but not much. If we knew

how it happened and what it was doing to the air-flow, maybe we could

design jet-pods with the right shape to use that air-flow and get good

performance."

Foster turned and peered sharply at Morrow. "Bill, doesn't that

gravitor's field work by conductivity of some sort through the

surrounding material?"

"Uh?" Morrow started. "Yes, it--wait! You mean the ship's plastic hull?"

"Right. And what about the polarization of that plastic?"

Morrow pursed his lips, contemplatively. "Like all materials on Earth,

it's polarized--if you want to use that word--to the gravitational and

magnetic fields of Earth. I see what you're driving at, though--the

gravitors establish a field in which the Earth's gravity and magnetism

are cancelled out, or bent back upon themselves. The mechanism of the

gravitors, the hull they support, everything within their field of

influence is placed on a basis of its own gravity, mass-attraction,

magnetism, what-have-you."

"And that's gradually changing the polarization of those materials,"

Foster concluded. "And the gravitors' field, working through the

material, is also affected. There's a gradual change in its influence

on other surrounding matter--and on the slipstream flowing over the

ship!"

"We'd need a wind-tunnel to test that, wouldn't we?" Smitty asked

dejectedly.

"Yep," Foster agreed. "And wind-tunnels cost money. The only other way

to test it would be to make a cross-country flight, and I wouldn't

advise that."

"What about a cross-country night flight?" Morrow wondered.

Foster gave him a strange look. "You two haven't been reading the

newspapers lately, have you?"

* * * * *

Morrow and Smitty exchanged glances of mingled surprise and guilt.

"We've been rather busy out here," Morrow protested lamely.

"I suspected you were," Foster said, a trace of grim humor in his

voice. He walked over to the drafting table in the corner, where he'd

left his shotgun and bundle of newspapers. "Pull that thing down and

come over here," he told them. "I've something to show _you_, now!"

Morrow cranked the gravitor-sling down on the hand winch and Smitty

shut it off; then they went over to where Foster was spreading

newspapers on the drafting table, checking and circling columns of

newsprint with a blue crayon pencil. Morrow stepped to his side and

stared down at the papers. The words fairly leaped up to strike him in

the eye.

The Machine That Floats · 第 13 / 21 题