Keyes held up the pile of papers at the side of the desk. “I have read nothing else but it and the news accounts in the last thirty-six hours!”

“You have noted, then, the very precise specifications given in disclosing the mechanism of the toy. You have noted that the patent states this is based on a newly discovered Law of Nature.”

“Indeed I have!” said Keyes bitterly. “And what Law of Nature may I assume it to be?”

“ Not the one we found during Project Levitation!” said Mart in sudden intensity. “ Not that one — do you understand what that means, Dr. Keyes? I have not betrayed the confidences and work of Project Levitation.”

“That doesn’t make sense. Project Levitation produced antigravity. You utilize the principle of antigravity in these toys of yours. Therefore you utilize the results of Project Levitation, which you were sworn to protect in all secrecy.”

“No.” Mart shook his head firmly. “There is more than just one principle. To make a crude analogy: One might produce a motor car powered by steam or electricity or gasoline engines. The car would perform the same operations, within limits, regardless of the type of power. Beyond those limits, of course, the similarity would vanish.

“So it is with Project Levitation and my little toy. You wanted us to find a means of building a Buck Rogers flying belt. We didn’t do it, but we did find a means of powering thousand-ton airships and spaceships.

“No possible utilization of the particular principle involved in the work of Project Levitation would produce a flying belt. On the other hand, my little toy, as described in the patent, will never be extrapolated to produce spaceships. Its maximum capacity is a little over two pounds, and cannot be scaled up. It is true that new, and at present unknown, designs based on this new Law of Nature can produce spaceships or flying belts — but they are not inherent in the Nagle Rocket toy. I have not violated the secrecy which I swore in connection with my work at ONR. I have not betrayed you. Believe me, I have not!”

“How can you defend such a position?” Keyes demanded. “All the world knows that antigravity is now available, in principle at least.”

“You will note that I was careful not to state that principle in my patent disclosure. I could not patent the principle itself, of course, and it was not required to be disclosed, so it remains unknown.”