The trip to Lincoln Head took almost an hour. Barney and Jim landed in their landing yards and took the book and the searchlight-thing inside. They went to their laboratory, and called for sandwiches and tea. Jim's sister brought in the food a little later and found them tinkering with the big beam tube. "What have you got this time?" she groaned. "Name it and it's yours," laughed Barney. "A sort of gadget that we found on the Red Desert." "What does it do?" asked Christine Baler. "Well," said Jim, "it's a sort of a kind of a dingbat that does things." "Uh-huh," said Christine. "A dololly that plings the inghams." "Right!" "You're well met, you two. Have your fun. But for Pete's sake don't forget to eat. Not that you will, I know you, but a girl has got to make some sort of attempt at admonishment. I'm going to the moom-picher. I'll see you when I return." "I'd say stick around," said Barney. "But I don't think we'll have anything to show you for hours and hours. We'll have something by the time you return." Christine left, and the men applied themselves to their problem. Barney had done wonders in unraveling the unknown. Inductances, he found, were spirals; resistance were dotted lines; capacitances were parallel squares. "What kind of stuff do we use for voltages?" asked Jim. "That's a long, hard trail," laughed Barney. "Basing my calculations on the fact that their standard voltage cell was the same as ours, we apply the voltages as listed on my schematic here." "Can you assume that their standard is the same as ours?" "Better," said Barney. "The Terran Standard Cell--the well-known Weston Cell--dishes out what we call 1.0183 volts at twenty degrees C. Since the Martian description of their Standard Cell is essentially the same as the Terran, they are using the same thing. Only they use sense and say that a volt is the unit of a standard cell, period. Calculating their figures on the numerical base of twelve is tricky, but I've done it." "You're doing fine. How do you assume their standard is the same?" "Simple," said Barney in a cheerful tone. "Thank God for their habit of drawing pictures. Here we have the well-known H tube. The electrodes are signified by the symbols for the elements used. The Periodic Chart in the first section came in handy here. But look, master mind, this dinky should be evacuated, don't you think?" "If it's electronic or subelectronic, it should be. We can solder up this breach here and apply the hyvac pump. Rig us up a power supply whilst I repair the blowout." "Where's the BFO?" "What do you want with that?" asked Jim. "The second anode takes about two hundred volts worth of eighty-four cycles," explained Barney. "Has a sign that seems to signify 'In Phase,' but I'll be darned if I know with what. Y'know, Jim, this dingbat looks an awful lot like one of the drivers we use in our spaceships and driver-wing fliers."