He scowled at the dials before him. The plane flew on.

This was the last leg of the trip, and now it should be no more than an hour and a half before they reached their destination. Joe felt a lift of elation. The Space Platform was a realization—or the beginning of it—of a dream that had been Joe’s since he was a very small boy. It was also the dream of most other small boys at the time. The Space Platform would make space travel possible. Of course it wouldn’t make journeys to the moon or planets itself, but it would sail splendidly about the Earth in an orbit some four thousand miles up, and it would gird the world in four hours fourteen minutes and twenty-two seconds. It would carry atom-headed guided missiles, and every city in the world would be defenseless against it. Nobody could even hope for world domination so long as it floated on its celestial round. Which, naturally, was why there were such desperate efforts to destroy it before its completion.

But Joe, thinking about the Platform, did not think about it as a weapon. It was the first rung on the stepladder to the stars. From it the moon would be reached, certainly. Mars next, most likely. Then Venus. In time the moons of Saturn, and the twilight zone of Mercury, and some day the moons of Jupiter. Possibly a landing could be dared on that giant planet itself, despite its gravity.

The co-pilot spoke suddenly. “How do you rate this trip by cargo plane?” he asked curiously. “Mostly even generals have to go on the ground. You rate plenty. How?”

Joe pulled his thoughts back from satisfied imagining. It hadn’t occurred to him that it was remarkable that he should be allowed to accompany the gyros from the plant to their destination. His family firm had built them, so it had seemed natural to him. He wasn’t used to the idea that everybody looked suspicious to a security officer concerned with the safety of the Platform.

“Connections? I haven’t any,” said Joe. Then he said, “I do know somebody on the job. There’s a Major Holt out there. He might have cleared me. Known my family for years.”

“Yeah,” said the co-pilot drily. “He might. As a matter of fact, he’s the senior security officer for the whole job. He’s in charge of everything, from the security guards to the radar screens and the jet-plane umbrella and the checking of the men who work in the Shed. If he says you’re all right, you probably are.”

Joe hadn’t meant to seem impressive. He explained: “I don’t know him too well. He knows my father, and his daughter Sally’s been kicking around underfoot most of my life. I taught her how to shoot, and she’s a better shot than I am. She was a nice kid when she was little. I got to like her when she fell out of a tree and broke her arm and didn’t even whimper. That shows how long ago it was!” He grinned. “She was trying to act grown-up last time I saw her.”

The co-pilot nodded. There was a brisk chirping sound somewhere. The pilot reached ahead to the course-correction knob. The plane changed course. Sunshine shifted as it poured into the cabin. The ship was running on automatic pilot well above the cloud level, and at an even-numbered number of thousands of feet altitude, as was suitable for planes traveling south or west. Now it droned on its new course, forty-five degrees from the original. Joe found himself guessing that one of the security provisions for planes approaching the Platform might be that they should not come too near on a direct line to it, lest they give information to curious persons on the ground.

Time went on. Joe slipped gradually back to his meditations about the Platform. There was always, in his mind, the picture of a man-made thing shining in blinding sunlight between Earth and moon. But he began to remember things he hadn’t paid too much attention to before.