"That"s the next thing on the agenda," Al-Amin said. "This seasick roll is caused by the unevenness of the load, and I"m pretty sick of it, myself. Smith, will you and Mr. Kelvin get out the emergency rockets? We"ll see what we can do to stabilize our platform."

It took better than an hour to get the ship straightened out. For the main job, emergency rockets were set off at the appropriate spots around the hull to counteract the rotation. The final tr.i.m.m.i.n.g was done with carbon dioxide fire extinguishers, which Smith and Jayjay Kelvin used as jets.

Getting a fix on Pluto was easy enough; the lighthouse station at Styx broadcast a strong beep sunward every ten seconds. They could also pick up the radio lighthouses on Eros, Ceres, Luna, and Mimas.

Evidently, the one on t.i.tan was behind the Jovian bulk.

They were ready to send their distress call.

"It"s simple," Smith said as he opened the red panel in the wall of the control room. "First we turn on the receiver." He pushed a b.u.t.ton marked _R_. "Then we turn these two wheels here until the pip on that little screen is centered. That"s the signal from Pluto. It comes in strong every ten seconds, see?"

Jayjay watched with interest. He"d heard about screamers and had seen them, but he"d never had the opportunity of observing one in action.

Like flares or bombs, they were intended for one-time use. The instructions were printed plainly on the inside of the red door, and Smith was simply reading off what was printed there.

"These wheels," he was saying, "line up the parabolic reflector with the Pluto signal, you see. There. Now we"ve got it centered. Now, all we have to do is make one small correction and we"re all set. These things are built so that they"re fool-proof; a kid could operate it.

Watch."

Facing each other across a small gap were a pair of tapered screw plugs, one male and one female. The male was an average of half an inch in diameter; the female was larger and bored to fit the male.

"The female plug," Smith said, "leads to two tanks of high-pressure gas inside this cabinet on the left. One tank of oxygen, one of hydrogen. See how this male plug telescopes out to fit into the female? All we have to do is thread them together, and everything is automatic."

Jayjay was aware that Smith"s explanations were meant to give Jeffry Hull something to think about instead of his fears. Hull was basically an Earth-hugger, and free fall did nothing to keep him calm. Evidently his subconscious knew that he had to latch on to something to keep his mental equilibrium, because he showed a tremendous amount of interest in what should have been a routine operation.

"How do you mean, it"s all automatic?" he asked. "What happens?"

"Well, you can"t see into the female plug, but look here at the male.

See those concentric tubes leading into the interior of the cabinet on the right? The outer one leads in the oxygen, the inner leads in the hydrogen. We need twice as much hydrogen as oxygen, so the inner tube has twice the volume delivery as the outer. See?"

"Yes. But what is the solid silver bar in the center of the inner tube?"

"That"s the electrical connection for the starter battery. There"s a small, short-lived chemical battery, like the ones in an ordinary pocket radio, except that they"re built to deliver a high-voltage, high-amperage current for about a tenth of a second. That activates the H-O cell, you see. Also, that silver stud depresses the corresponding stud in the female plug, which turns on the gas flow before it makes the connection with the starter battery. Follow?"

Hull didn"t look as though he did, but he nodded gamely. "Then what happens?"

"Then the hydrogen and the oxygen come together in the fuel cell and, instead of generating heat, they generate electric current. That current is fed into the radio unit, and the signal is sent to Pluto.

Real simple."

"I see," Hull said. "Well ... go ahead."

Smith telescoped the two leads together and began turning the collar on the female plug.

He screwed it up as far as it would go.

And nothing happened.

"What the h.e.l.l?" asked Smith of no one in particular. He tried to twist it a little harder. Nothing happened. The threads had gone as far as they would go.

"What"s the matter?" Jayjay asked.

"Damfino. No connection. Nothing"s happening. And it"s as tight as it will go."

"Are the gases flowing?" Jayjay asked.

"I don"t know. These things aren"t equipped with meters. They"re supposed to work automatically."

Jayjay pushed Smith aside. "Let me take a look."

Smith frowned as though he resented an ordinary pa.s.senger shoving him around, but Jayjay ignored him. He c.o.c.ked his head to one side and looked at the connection. "Hm-m-m." He touched it with a finger. Then he wet the finger with his tongue and touched the connection again.

"There"s no gas flow, Smith."

"How do you know?" Smith was still frowning.

"There"s a gap there. That tapered thread isn"t in tight. If there were any gas flowing, it would be leaking out." Before Smith could say anything Jayjay began uns.c.r.e.w.i.n.g the coupling. When it came apart, it looked just the same as it had before Smith had put it together.

In the dim glow from the emergency lights, it was difficult to see anything.

"Got an electric torch?" Jayjay asked.

Smith pushed himself away from the screamer panel and came back after a moment with a flashlight. "Let me take a look," he said, edging Jayjay aside. He looked over the halves of the coupling very carefully, then said: "I don"t see anything wrong. I"ll try it again."

"Hold on a second," Jayjay said quietly. "Let me take a look, will you?"

Smith handed him the torch. "Go ahead, but there"s nothing wrong."

Jayjay took the light and looked the connections over again. Then he screwed his head around so that he could look into the female plug.

"Hm-m-m. Hard to count. Gap"s too small. Anybody got a toothpick?"

n.o.body did.

Jayjay turned to Jeffry Hull. "Mr. Hull, would you mind going to the lounge? I think there"s some toothpicks in the snack refrigerator."

"Sure," said Hull. "Sure."

He pushed himself across the control room and disappeared through the stairwell.

"Get several of them," Jayjay called after him.

Captain Al-Amin said: "What"s the trouble, Mr. Kelvin?"

"I"m not sure yet," Jayjay answered. "When did you last have the screamer units inspected?"

"Just before we took off from Jove Station," Al-Amin said. "That"s the law. All emergency equipment has to be checked before takeoff. Why?

What"s the matter?"