"That's easy to say," Klythe grumbled, "but you know how things can go at the last minute. I'm worried about those tensile differences." Crayley stroked his mustache and nodded. The material used in the interior of the model was supposed to approximate the highly radioactive material in the real thing as closely as possible, but there might be just enough difference in critical spots to require some small adjustments in the tape. If a man's hand applied just enough pressure and torque to twist a piece of copper wire just so, it might be too much or too little for a radioactive alloy wire that would be used in the same place in the production piece. After the suppressor field had been switched on in the hull of the finished generator, the energy generated by the workings of the intensely radioactive interior would be compressed to the sub-nucleonic level, where it could be controlled. Unfortunately, the machine couldn't be built inside a suppressor field; that would be like trying to build a ship in a bottle when the bottle's neck was sealed shut. Crayley said, "I've got a lot of stuff to do on Line Number Two this morning, but I'd like to see the run-off." "Sure," said Klythe abstractedly, "come ahead." Crayley didn't go to Number Two. He headed directly for the recording room. All he needed was ten minutes alone in there. Provided, of course, that it was empty. * * * * * It was. Crayley took a quick look up and down the corridor and stepped inside. He locked the door behind him. If anyone tried to come in, he'd be able to cover. It was better to have someone wonder why the door was locked than to be caught messing with the tapes when he shouldn't be. Of course, if someone did try the door, it would mean that his chance of getting Klythe this time would be gone. But there would always be another time. First, the tape. He flipped open the cover to the receiving reel. Sure enough, it was still there from yesterday's trial run, a huge reel of foot-wide blue plastic ribbon. Good enough. He punched the "fast" button and ran it through to the last few minutes of the recording. He glanced at the monitor screen. The model was still on the assembly table in the tunnel deep underground. He cut off the current to the secondaries and switched on the manual controls. Then he put his hands into one set of gloves and wiggled his fingers. The secondaries in the room below remained motionless. Number Nineteen Experimental ought to be empty. He withdrew his hand and turned the selector knob on the monitor screen to Nineteen. No one there. He switched on the power, letting the last few minutes of the taped recording feed into the secondaries in Nineteen. The waldoes in the screen went through the motions of finishing the assembly--meaningless gestures in the empty air--then fell into the "ready" position. Crayley hit the stop button, then switched back to the tunnel where the model lay.