"Well, high tension juice will flash over better under ultraviolet illumination. The tube must be high enough to exceed this distance by ten to one at the operating voltage of the stuff down the line. The boys in the Palanortis Jungles say they're a godsend, since there are a lot of places where the high tension towers would be impossible since the Palanortis Whitewood grows about a thousand feet tall." "You'd cut a lot of wood to ream a path through from Northern Landing to the power station on the Boiling River," said Arden. "Yeah," drawled Don, "and towers a couple of hundred miles apart are better than two thousand feet. Yeah, these things are the nuts for getting power shipped across country." "Couldn't we squirt it out from Terra?" asked Arden. "That would take the curse off of our operating expenses." "It sure would," agreed Channing heartily. "But think of the trouble in aligning a beam of that distance. I don't know--there's this two hundred miles' restriction, you know. They don't transmit worth a hoot over that distance, and it would be utterly impossible to maintain stations in space a couple of hundred miles apart, even from Venus, from which we maintain a fairly close tolerance. We might try a hooting big one, but the trouble is that misalignment of the things result in terrible effects." The door opened and Chuck Thomas and Walt Franks entered. "How's our playthings?" asked Walt. "Cockeyed looking gadgets," commented Chuck. "Take a good look at 'em," said Channing. "Might make some working X-ray plates, too. It was a lucky day that these got here before the boys from Terran Electric. I doubt that they'd permit that." "O.K.," said Chuck, "I'll bring the X-ray up here and make some pix. We'll want working prints; Warren will have to take 'em and hang dimensions on to fit." "And we," said Channing to Walt Franks, "will go to our respective offices and wait until the Terran Electric representatives get here." The ship that came with the tubes took off from the landing stage, and as it passed their observation dome, it caught Don's eye. "There goes our project for the week," he said. "Huh?" asked Walt. "He's been like that ever since we tracked him down on the _Ariadne_," said Arden. "I mean the detection of driver radiation," said Channing. "Project for the week?" asked Walt. "Brother, we've been tinkering with that idea for months, now." "Well," said Don, "there goes four drivers, all batting out umpty-ump begawatts of something. They can hang a couple of G on a six hundred foot hull for hours and hours. The radiation they emit must be detectable; don't tell me that such power is not." "The interplanetary companies have been tinkering with drivers for years and years," said Walt. "They have never detected it?"