Mr. Carver half-rose, then settled back and spoke with a level voice, while his eyes swept from one to the other of the five men.

"I want to report honestly on this case, sirs. Just before we left, we started back along a course that would take us fairly close to all our planets and the sun, to make sure our senders were functioning correctly. We started from Two, where we had just completed marking-out our city site, went past One and around the sun, planning to make a big swing to the other planets and so back home. The senders of One, Two and the sun were working all right, but as we neared Three we heard, instead of our own, signals stating that the system had been charted and claimed by Michael Bogin and his...."

"Slik Bogin!" Several of the Board members exclaimed in concert, and Chairman Wilson added, grimly, "So he's at work again."

Mr. Carver waited until they were silent, then continued, "We think he either destroyed our senders or substituted his own tapes in ours. However, we put our sun-signal into an orbit so close to the sun's surface we doubt if he'll be able to do anything about it. It's only about ten million miles...."

"Ten million!" Reardon almost yelled the question, and the others sat upright in excited astonishment, doubt showing in their faces. "How could you do that?"

"I figured a van Sicklenberg, sir, to give our sender a circular orbit apexing at ten million miles," Jon Carver explained simply. "We used the servo-mechs in our lock to throw the sender out when at minimum distance."

"You?" There was a concerted expression of disbelief and Mr. Reardon said, witheringly, "Why, you're not a listed astrogator. How could you compute a ... a what was it you called it?"

"A van Sicklenberg throw-out orbit, sir. I...."

"Never heard of a van Sicklenberg. What is it ... what sort of nonsense are you talking?"

Jon opened his mouth to reply, but his mother forestalled him. She rose determinedly. "My Jon is 'only a boy,' gentlemen, but he has also become an expert pilot and an excellent astrogator, if I do say so myself. He is also an inventor, and will shortly apply for patents on a new automatic piloting system—which I don't pretend to understand anything about, but which I do know from watching its use is far in advance of anything you now have. You can be sure he knows how to do such a simple thing as plot an orbit." She sat down, eyes defiant, her mouth in a straight line.