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ships to get on an exact course, at an exact speed, at an exact moment, time was needed. So the fleet made almost a complete circuit of the Earth before reaching the height of the Platform's orbit.

They joined it. A single man in a space suit, anchored to its outer plates, directed a plastic hose which stretched out impossibly far and clamped to one drone with a magnetic grapple. He maneuvered it to the hull and made it fast. He captured a second, which was worked delicately within reach by coy puffs of steering-rocket vapor.

One by one, the drones were made fast. Then the manned ship went in the lock and the great outer door closed, and the plastic-fabric walls collapsed behind their nets, and air came in.

Lieutenant Commander Brown was the one to come into the lock to greet them. He shook hands all around—and it again seemed strange to all the four from Earth to find themselves with their feet more or less firmly planted on a solid floor, but their bodies wavering erratically to right and left and before and back, because there was no up or down.

"Just had reports from Earth," Brown told Joe comfortably.[Pg 106] "The news of your take-off was released to avoid panic in Europe. But everybody who doesn't like us is yelling blue murder. Somebody—you may guess who—is announcing that a fleet of ninety-one war rockets took off from the United States and now hangs poised in space while the decadent American war-mongers prepare an ultimatum to all the world. Everybody's frightened."

"If they'll only stay scared until we get unloaded," said Joe in some satisfaction, "the government back home can tell them how many we were and what we came up for. But we'll probably make out all right, anyhow."

"My crew will unload," said Brown, in conscious thoughtfulness. "You must have gotten pretty well exhausted by that acceleration."

Joe shook his head. "I think we can handle the freight faster. We found out a few things by going back to Earth."

A section of plating at the top of the lock—at least it had been the top when the Platform was built on Earth—opened up as on the first journey here. A face grinned down. But from this point on, the procedure was changed. Haney and Joe went into the cargo-section of the rocketship and heaved its contents smoothly through weightlessness to the storage chamber above. The Chief and Mike stowed it there. The speed and precision of their work was out of all reason. Brown stared incredulously.

The fact was simply that on their first trip to the Platform, Joe and his crew didn't know how to use their strength where there was no weight. By the time they'd learned, their muscles had lost all tone. Now they were fresh from Earth, with Earth-strength muscles—and they knew how to use them.

"When we got back," Joe told Brown, "we were practically invalids. No exercise up here. This time we've brought some harness to wear. We've some for you, too."

They moved out of the airlock, and the ship was maneuvered to a mooring outside, and a drone took its place. Brown's eyes blinked at the unloading of the drone. But he said, "Navy style work, that!"

"Out here," said Joe, "you take no more exercise than an[Pg 107] invalid on Earth—in fact, not as much. By now the original crew would have trouble standing up on a trip back to Earth. You'd feel pretty heavy, yourself."

Brown frowned.

"Hm. I—ah—I shall ask for instructions on the matter."

He stood erect. He didn't waver on his feet as the others did. But he wore the same magnetic-soled shoes. Joe knew, with private amusement, that Brown must have worked hard to get a dignified stance in weightlessness.

"Mr. Kenmore," said Brown suddenly. "Have you been assigned a definite rank as yet?"

"Not that I know of," said Joe without interest. "I skipper the ship I just brought up. But——"

"Your ship has no rating!" protested Brown irritably. "The skipper of a Navy ship may be anything from a lieutenant junior grade to a captain, depending on the size and rating of the ship. In certain circumstances even a noncommissioned officer. Are you an enlisted man?"

"Again, not that I know of," Joe told him. "Nor my crew, either."

Brown looked at once annoyed and distressed.

"It isn't regular!" he objected. "It isn't shipshape! I should know whether you are under my command or not! For discipline! For organization! It should be cleared up! I shall put through an urgent inquiry."

Joe looked at him incredulously. Lieutenant Commander Brown was a perfectly amiable man, but he had to have things in a certain pattern for him to recognize that they were in a pattern at all. He was more excited over the fact that he didn't know whether he ranked Joe, than over the much more important matter of physical deterioration in the absence of gravity. Yet he surely understood their relative importance. The fact was, of course, that he could confidently expect exact instructions about the last, while he had to settle matters of discipline and routine for himself.

"I shall ask for clarification of your status," he said worriedly. "It shouldn't have been left unclear. I'd better attend to it at once."[Pg 108]

He looked at Joe as if expecting a salute. He didn't get it. He clanked away, his magnetic shoe-soles beating out a singularly martial rhythm. He must have practised that walk, in private.

Joe got out of the airlock as another of the space barges was warped in. Brent, the crew's psychologist, joined him when he went to unload. Brent nodded in a friendly fashion to Joe.

"Quite a change, eh?" he said drily. "Sanford turned out to be a crackpot with his notions of grandeur. I'm not sure that Brown's notions of discipline aren't worse."

Joe said, "I've something rather important to pass on," and told about the newly discovered physical effects of a long stay where there was no gravity. The doctors now predicted that anybody who spent six months without weight would suffer a deterioration of muscle tone which could make a return to Earth impossible without a long preliminary process of retraining. One's heart would adjust to the absence of any need to pump blood against gravity.

"Which," said Joe, "means that you're going to have to be relieved before too long. But we brought up some gravity-simulator harness that may help."

Brent said desolately: "And I was so pleased! We all had trouble with insomnia, at first, but lately we've all been sleeping well! Now I see why! Normally one sleeps because he's tired. We had trouble sleeping until our muscles got so weak we tired anyhow!"

Another drone came in and was unloaded. And another and another. But the last of them wasn't only unloaded. Haney took over the Platform's control board and—grinning to himself—sent faint, especially-tuned short wave impulses to the steering-rockets of the drone. The liquid-fuel rockets were designed to steer a loaded ship. With the airlock door open, the silvery ship leaped out of the dock like a frightened horse. The liquid-fuel rocket had a nearly empty hull to accelerate. It responded skittishly.

Joe watched out a port as it went hurtling away. The vast[Pg 109] Earth rolled beneath it. It sped on and vanished. Its fumes ceased to be visible. Joe told Brent:

"Another nice job, that! We sent it backward, slowing it a little. It'll have a new orbit, independent of ours and below it. But come sixty hours it will be directly underneath. We'll haul it up and refuel it. And our friends the enemy will hate it. It's a radio repeater. It'll pick up short-wave stuff beamed to it, and repeat it down to Earth. And they can try to jam that!"

It was a mildly malicious trick to play. Behind the Iron Curtain, broadcasts from the free world couldn't be heard because of stations built to emit pure noise and drown them out. But the jamming stations were on the enemy nations' borders. If radio programs came down from overhead, jamming would be ineffective at least in the center of the nations. Populations would hear the truth, even though their governments objected.

But that was a minor matter, after all. With space ship hulls coming into being by dozens, and with one convoy of hundreds of tons of equipment gotten aloft, the whole picture of supply for the Platform had changed.

Part of the new picture was two devices that Haney and the Chief were assembling. They were mostly metal backbone and a series of tanks, with rocket motors mounted on ball and socket joints. They looked like huge red insects, but they were officially rocket recovery vehicles, and Joe's crew referred to them as space wagons. They had no cabin, but something like a saddle. Before it there was a control-board complete with radar-screens. And there were racks to which solid-fuel rockets of divers sizes could be attached. They were literally short-range tow craft for travel in space. They had the stripped, barren look of farm machinery. So the name "space wagon" fitted. There were two of them.

"We're putting the pair together," the Chief told Joe. "Looks kinda peculiar."

"It's only for temporary use," said Joe. "There's a bigger and better one being built with a regular cabin and hull. But some experience with these two will be useful in running a regular space tug."[Pg 110]

The Chief said with a trace too much of casualness: "I'm kind of looking forward to testing this."

"No," said Joe doggedly. "I'm responsible. I take the first chance. But we should all be able to handle them. When this is assembled you can stand by with the second one. If the first one works all right, we'll try the second."

The Chief grimaced, but he went back to the assembly of the spidery device.

Joe got out the gravity-simulator harnesses. He showed Brent how they worked. Brown hadn't official instructions to order their use, but Joe put one on himself, set for full Earth-gravity simulation. He couldn't imitate actual gravity, of course. Only the effect of gravity on one's muscles. There were springs and elastic webbing pulling one's shoulders and feet together, so that it was as much effort to stand extended—with one's legs straight out—as to stand upright on Earth. Joe felt better with a pull on his body.

Brent was upset when he found that to him more than a tenth of normal gravity was unbearable. But he kept it on at that. If he increased the pull a very little every day, he might be able to return to Earth, in time. Now it would be a very dangerous business indeed. He went off to put the other members of the crew in the same sort of harness.

After ten hours, a second drone broadcaster went off into space. By that time the articulated red frameworks were assembled. They looked more than ever like farm machinery, save that their bulging tanks made them look insectile, too. They were actually something between small tow-boats and crash-wagons. A man in a space suit could climb into the saddle of one of these creations, plug in the air-line of his suit to the crash-wagon's tanks, and travel in space by means of the space wagon's rockets. These weird vehicles had remarkably powerful magnetic grapples. They were equipped with steering rockets as powerful as those of a ship. They had banks of solid-fuel rockets of divers power and length of burning. And they even mounted rocket missiles, small guided rockets which could be used to destroy what could not be recovered. They were intended to handle unmanned rocket shipments of supplies[Pg 111] to the Platform. There were reasons why the trick should be economical, if it should happen to work at all.

When they were ready for testing, they seemed very small in the great space lock. Joe and the Chief very carefully checked an extremely long list of things that had to work right or nothing would work at all. That part of the job wasn't thrilling, but Joe no longer looked for thrills. He painstakingly did the things that produced results. If a sense of adventure seemed to disappear, the sensations of achievement more than made up for it.

They got into space suits. They were in an odd position on the Platform. Lieutenant Commander Brown had avoided Joe as much as possible since his arrival. So far he'd carefully avoided giving him direct orders, because Joe was not certainly and officially his subordinate. Lacking exact information, the only thing a conscientious rank-conscious naval officer could do was exercise the maximum of tact and insistently ask authority for a ruling on Joe's place in the hierarchy of rank.

Joe flung a leg over his eccentric, red-painted mount. He clipped his safety-belt, plugged in his suit air-supply to the space wagon's tanks, and spoke into his helmet transmitter.

"Okay to open the lock. Chief, you keep watch. If I make out all right, you can join me. If I get in serious trouble, come after

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