"Eh?" McAllen's eyes narrowed suddenly. "What was the conclusion?"
"That you've invented something that's really a little too good."
"Too good?" said McAllen. "Hm-m-m. Go on."
"It doesn't take much power to operate the thing, does it?"
"Not," said McAllen dryly, "if you're talking about the kind of power one pays for."
"I am. Can the McAllen Tube be extended to any point on Earth?"
"I should think so."
"And you financed the building of this model yourself. Not very expensive. If the secret leaked out, I'd never know who was going to materialize in my home at any time, would I? Or with what intentions."
"That," McAllen nodded, "is about the size of it."
Barney crushed out his cigarette, lit a fresh one, blew out a thin streamer of smoke. "Under the circumstances," he remarked, "it's unfortunate you can't get the thing shut off again, isn't it?"