he mechanic and electrician.

"I'm afraid our time is getting short, Steve," she announced, after
making an observation. "It looks as though we're getting wherever it
is we're going."

"Well, I've got only two more jobs to do, but they're the hardest of the
lot. It is Jupiter, or can you tell yet?"

"Jupiter or one of its satellites, I think, from the point where they
reversed their power. Here's the observation you told me to take."

"Looks like Jupiter," he agreed, after he had rapidly checked her
figures. "We'll pass very close to one of those two satellites--probably
Ganymede--which is fine for our scheme. All four of the major satellites
have water and atmosphere, but Ganymede, being largest, is best for our
purposes. We've got a couple of days yet--just about time to finish up.
Let's get going--you know what to do."

"Steve, I'm afraid of it. It's too dangerous--isn't there some other
way?"

"None that I can see. The close watch they're keeping on every bit of
this junk makes it our only chance for a get-away. I'm pretty sure I
can do it--but if I should happen to get nipped, just use enough power
to let them know you're here, and you won't be any worse off than if
I hadn't tried to pull off this stunt."

He donned a space-suit, filled a looped belt with tools, picked up a
portable power-drill, and stepped into the tiny air-lock. Nadia deftly
guided their segment against one of the larger fragments and held it
there with a gentle, steady pressure, while Stevens, a light cable
paying out behind him, clambered carefully over the wreckage, brought
his drill into play, and disappeared inside the huge wedge. In less than
an hour he returned without mishap and reported to the glowing girl.

"Just like shooting fish down a well! Most of the accumulator cells were
tight, and installing the relays wasn't a bad job at all. Believe me,
girl, there'll be junk filling all the space between here and Saturn
when we touch them off!"

"Wonderful, Steve!" Nadia exclaimed. "It won't be so bad seeing you go
into the others, now that you have this one all rigged up."

* * * * *

Around and around the mass of wreckage they crept, and in each of the
larger sections Stevens connected up the enormous fixed or dirigible
projectors to whatever accumulator cells were available through
sensitive relays, all of which he could close by means of one radio
impulse. The long and dangerous task done, he s