"Oh, they won't steal it," Porter said bitterly. "Heaven's-to-Betsy no! But this invention of mine will mean that the United States of America will be in complete control of the planets and the space between. When the Government wants a piece of property, they try to buy it at their price; if they can't do that, they condemn it and pay the owner what they think it's worth—not what the owner thinks it's worth. The same thing applies here; they'd give me what they thought I ought to have—in ten years or so. Look what happened to Fermi.
"No, Elshawe; when the Government comes begging to me for this invention, they can have it—on my terms."
"Going to keep it a secret, eh? You can't keep a thing like that secret. Look what happened with atomic energy after World War Two. We kept it a secret from the Russians, didn't we? Fine lot of good that did us. As soon as they knew it was possible, they went to work on it. Nature answers any questions you ask her if you ask her the right way. As soon as the Government sees that your spaceship works, they'll put some of their bright physicists to work on it, and you'll be in the same position as you would have been if you'd showed it to them in the first place. Why risk your neck?"
Porter shook his head. "The analogy isn't valid. Suppose someone had invented the A-bomb in 1810. It would have been a perfectly safe secret because there wasn't a scientist on Earth who included such a thing as atomic energy in his philosophy. And, believe me, this drive of mine is just as far ahead of contemporary scientific philosophy as atomic energy was ahead of Napoleon's scientists.
"Suppose I told you that the fuel my ship uses is a gas lighter than hydrogen. It isn't, but suppose I told you so. Do you think any scientist today could figure out how it worked? No. They know that there's no such thing as a gas with a lighter atomic weight than hydrogen. They know it so well that they wouldn't even bother to consider the idea.
"My invention is so far ahead of present-day scientific thought that no scientists except myself could have even considered the idea."
"O.K.; O.K.," Elshawe said. "So you're going to get yourself shot down to prove your point."
Porter grinned lopsidedly. "Not at all. You're still thinking in terms of a rocket. Sure—if I used a rocket, they'd knock me down fast, just as soon as I lifted above the mountains. But I don't have to do that. All I have to do is get a few feet of altitude and hug the ground all the way to the Pacific coast. Once I get out in the middle of the Pacific, I can take off straight up without being bothered at all."
"All right. If your machine will do it," the reporter said, trying to hide his skepticism.
"You still think I've got some kind of rocket, don't you?" Porter asked accusingly. He paused a moment, then, as if making a sudden decision, he said: "Look, Elshawe, I trust you. I'm going to show you the inside of that ship. I won't show you my engines, but I will prove to you that there are no rocket motors in her. That way, when you write up the story, you'll be able to say that you have first-hand knowledge of that fact. O.K.?"