"Very lucky," said Fenwick, "if you were able to accidentally obtain a crystal of fifteen layers or so and have each layer even approximately correct."
Sam smiled blandly. "Our first crystals were not so complex, you understand. Only three layers. We thought we were building transistors, then. Later, our mathematics showed us the advantage of additional layers and gave us the dimensions."
The mathematics that Baker said a kid could poke holes in. Fenwick didn't know. He hadn't checked the math.
Where was the gimmick?
In the afternoon they took him out for field tests again. A rise behind the barn was about a mile from a similar rise on Sam Atkins' place. They communicated across that distance in all the ways, including various kinds of codes, that Fenwick could think of to find some evidence of hoax. Afterwards, they returned to the laboratory and sawed in two the crystals they had just used. Then they showed him the tests they had devised to determine the nature of the radiation between the crystals.
He did not find the gimmick.
By the end of the day Ellerbee seemed beat, as if he'd been under a heavy strain all day long. And then Fenwick realized that was actually the case. Ellerbee wanted desperately to have someone believe in him, believe in his communication device. Not only had he used all the reasoning power at his command, he had been straining physically to induce Fenwick to believe.
Through it all, however, Sam Atkins seemed to remain bland and utterly at ease, as if it made absolutely no difference to him, whatever.
"I guess we've just about shot our wad," said Ellerbee. "That's about all we've got to show you. If we haven't convinced you by now that our communicator works, I don't know how we can accomplish it."
Had they convinced him? Fenwick asked himself. Did he believe what he had seen or didn't he? He had been smug in front of Baker after the first demonstration, but now he wondered how much he had been covered by the same brush that had tarred Baker.