And again Tom Ellingbery's lawyers passed up cross examination of Slim. I knew they were waiting for me.

They were. "Do you understand this machine?" one asked me scornfully.

"No, sir."

"You know how to work it, don't you?"

"Yes. I think so."

"Do you mean to tell this court that you can adjust the dials and gadgets on this thing and see what I was doing last week or the week before?"

I tried to be cautious. "If it's plugged in."

"Okay, we'll plug it in."

He invited me to step down and turn on the switches. I looked at Slim. He nodded. After all, there was nothing else to do. I went.

Some of the tubes crackled and then settled down to a steady green glow, and one bank showed purple. Then the lawyer said, "Now, do you mean to tell me you can tune this contraption in on a man's brain and find him anywhere in the past?" He sounded completely skeptical.