"Three more to go," Koa called. "Watch out!"

Only two went, and they were far enough away to offer no danger.

Santos had been fishing around in the instrument case. He triumphantly produced another stylus. "It was under the s.e.xtant," he explained. "I thought there was another one around somewhere."

"If we get through this I'll propose you for ten more stripes," Rip vowed.

"We'll make you the highest ranking sergeant that ever made a private's life miserable."

Working slowly but more safely, Rip figured that slightly more than two and a half tubes would do the trick.

Now to fire them. That meant finding a thorium crystal properly placed and big enough. There were plenty of crystals, so that was no problem. The next step was for Kemp to cut holes with his torch, so that the thrust of the rocket fuel would be counter to the direction in which the asteroid was spinning.

Rip explained to all hands what had to be done. The burden would fall on Kemp, who would need a helper. Rip took that job himself. He took one oxygen tank from Kemp. Koa took the other, leaving the torchman with only his torch.

Then Rip took a container of chemical fuel from Bradshaw. Working while running, he lashed the two containers together with his safety line. Then he improvised a rope sling so they could hang on his back. He wanted his hands free.

Kemp, meanwhile, a.s.sembled his torch and put the proper cutting nozzle in place. When he was ready, he moved to Rip's side and connected the hoses of the torch to the tanks the lieutenant carried. Kemp had the torch mechanism strapped to his own back. It was essentially a high pressure pump that drew oxygen and fuel from the tanks and forced them through the nozzle under terrific pressure.

When he had finished, he pressed the trigger that started the cutting torch going. The fuel ignited about a half inch in front of the nozzle.

The nozzle had two holes in it, one for oxygen and the other for fuel. The holes were placed and angled to keep the flame always a half inch away, otherwise the nozzle itself would melt.

"How do we work this?" Kemp asked.

"We'll get ahead of the others," Rip explained. "Keep up speed until we're running at the forward sun line. Then, when the crystal we want comes around into the shadow, we can stop running and work until it spins into the sunshine again."

"Got it," Kemp agreed.

Rip estimated the axis on which the asteroid was spinning and selected a crystal in the right position. He had to be careful, otherwise their counter-blast might do nothing more than start the gray planet wobbling.

He and Kemp ran ahead of the others. The Planeteers and their prisoners were running at a speed that kept them right in the middle of the dark area.

It was like running on a treadmill. The Planeteers were making good speed, but were actually staying in the same place relative to the sun's position, keeping the turning asteroid between them and the sun.

Rip and Kemp ran forward until they were right at the sun line. Then they slowed down, holding position and waiting for the crystal they had chosen to reach them. As it came across the sun line into darkness they stopped running and rode the crystal through the shadow until it reached the sun again. Then the two Planeteers ran back across the dark zone to meet the crystal as it came around again. There was only a few minutes' working time each revolution.

Kemp worked fast, and the first hole deepened. Rip helped as best he could by pushing away the chunks of thorium that Kemp cut free, but it was essentially a one-man job.

As Kemp neared the bottom of the first hole, Rip reviewed his plan and realized he had overlooked something. These weren't nuclear bombs; they were simple tubes of chemical fuel. The tubes wouldn't destroy the hole Kemp was cutting.

He reached a quick decision and called Koa to join them. Koa appeared as Kemp pulled his torch from the hole and started running again to avoid the sun. Rip and Koa ran right along with him, crossing the dark zone to meet the crystal as it came around again.

"There's no reason to drill three holes," Rip explained as they ran.

"We'll use one hole for all three charges. They don't have to be fired all at once."

"How do we fire them?" Koa asked.

"Electrically. Who has the exploders and the hand dynamo?"

"Dowst has the exploders. One of the Connies is carrying the dynamo."

Speaking of the Connies ... Rip hadn't seen the Consops cruiser recently.

He looked up, searching for its exhaust, and finally found it, a faint line some distance away.

The Connie commander was stalemated for the time being. He couldn't land his cruiser on a spinning asteroid, and he had no more boats. Rip thought he probably was just waiting around for any opportunity that might present itself.

The Federation cruisers should be arriving. He studied his chronometer.

No, the nearest one, the _Sagittarius_ from Mercury, wasn't due for another ten minutes or so. He turned up his helmet communicator and ordered all hands to watch for the exhaust of a nuclear drive cruiser, then turned it down again and gave Koa instructions.

"Have Trudeau turn his load over to a Connie and collect the exploders and the dynamo. We'll need wire, too. Who has that?"

"Another Connie."

"Get a reel. Cut off a few hundred feet and connect the dynamo to one end and an exploder to the other."

The crystal came around again and Kemp got to work. Rip stood by, again reviewing all steps. They couldn't afford to make a mistake. He had no margin of error.

Kemp finished the hole a few seconds before the crystal turned into the sunlight again. Rip told him to keep the torch going. There might be some last minute cutting to do. Then the lieutenant hurried off at an angle to where Dominico was plodding along with the fuel tubes.

Koa had turned the tube he carried over to a Connie. Rip got it, and told Dominico to follow him. Then he angled back across the asteroid to where Kemp was holding position.

The asteroid turned twice before Koa arrived. He had a coil of wire slung over his arm and he carried the dynamo in one hand and an exploder in the other, the two connected by the wire.

Rip took the exploder. "Uncoil the wire," he directed. "Go to its full length at right angles to the hole. We have to time this exactly right.

When the crystal comes around again, I'll shove the tube into the hole, then scurry for cover. When I'm clear I'll yell and you pump the dynamo.

Dominico and Kemp stay with Koa. Make sure no one is in the way of the blast."

Koa unreeled the wire, moving away from Rip. The lieutenant pushed the exploder into one end of the fuel tube and crimped it tightly with his gloved hand.

Koa and the others were as far away as they could get now, the wire stretching between them and Rip. Kemp had made sure no one was running near the line of blast.

Rip watched for the crystal. It would be coming around any second now. He held the tube with the exploder projecting behind him, ready for the hole to appear.

Koa's voice echoed in his helmet. "All set, Lieutenant."

"So am I," Rip answered. "Stand by."

The crystal appeared across the sun line and moved toward him. He met it, slowed his speed, put the end of the tube into the hole and shoved. Kemp had allowed enough clearance. The tube slid into place. Rip turned and angled off as fast as he could glide. When he was far enough away from the blast line he called, "Fire!"

[Ill.u.s.tration: "Fire!" Called Rip]

"Fire!" Called Rip

Koa squeezed the dynamo handle. The machine whined and current shot through the wire. A column of orange fire spurted from the crystal.

Rip watched the stars instead of the exhaust. He kept running as it burned soundlessly. In air, the noise would have deafened him. In airless s.p.a.ce, there was nothing to carry the sound.

The apparent motion of the stars was definitely slowing. The spinning wouldn't cease entirely, but it would slow down enough to give them more time to work.