"I shall be happy to present you with a book on essential radio technique," offered Channing. "A perusal of which will place you in possession of considerable knowledge. Will that suffice?" "I believe so. I can not understand how; being uncertain of your steps a few minutes ago, you are now presenting me with a circuit of your intended experiment." "The circuit is, of course, merely symbolic. We shall change many of the constants before the day is over--in fact, we may even change the circuit." "I shall require a notice before each change so that I may pass upon the legal aspects." "Walt," said Don, "will you accompany me to a transparency experiment on the Ninth Level?" "Be more than glad to," said Walt. "Let's go!" They left the office quickly, and started for Joe's. They had not reached the combined liquor-vending and restaurant establishment when the communicator called for Channing. It was announcing the arrival of Barney Carroll, so instead of heading for Joe's, they went to the landing stage at the south end of the Station to greet the visitor. * * * * * "Barney," said Don, "of all the companies, why did you pick on Terran Electric?" "Gave us the best deal," said the huge, grinning man. "Yeah, and they're getting the best of my goat right now." "Well, Jim and I couldn't handle anything as big as the power transmission set-up. They paid out a large slice of jack for the complete rights. All of us are well paid now. After all, I'm primarily interested in Martian artifacts, you know." "I wonder if they had lawyers," smiled Walt wryly. "Probably. And, no doubt, the legals had a lot to do with the fall of the Martian Civilization." "As it will probably get this one so bound up with red tape that progress will be impossible--or impractical." "Well, Barney, let's take a run up to the lab. We can make paper-talk even if Brother Kingman won't let us set it to soldering iron. There are a lot of things I want to ask you about the tube."