You start looking for other doors or corridors, but you know this is right. The signs along the halls are the same as they were. * * * * * Then there's a sort of cough and something dilates in the wall. It forms a perfect door and the elevator stands there waiting. You get in, gulping out something about going all the way down, and then wonder how a machine geared for voice operation can make anything of that. What the deuce would that lowest basement be called? But the elevator has closed and is moving downward in a hurry. It coughs again and you're at the original level. You get out--and realize you don't have a light. You'll never know what you stumbled over, but, somehow, you move back in the direction of the time machine, bumping against boxes, staggering here and there, and trying to find the right place by sheer feel. Then a shred of dim light appears; it's the weak light in the time machine. You've located it. You put the atomic generator in the luggage space, throw the papers down beside it, and climb into the cockpit, sweating and mumbling. You reach forward toward the green button and hesitate. There's a red one beside it and you finally decide on that. Suddenly, there's a confused yell from the direction of the elevator and a beam of light strikes against your eyes, with a shout punctuating it. Your finger touches the red button. You'll never know what the shouting was about--whether they finally doped out the fact that they'd been robbed, or whether they were trying to help you. You don't care which it is. The field springs up around you and the next button you touch--the one on the board that hasn't been used so far--sends you off into nothingness. There is no beam of light, you can't hear a thing, and you're safe. It isn't much of a trip back. You sit there smoking and letting your nerves settle back to normal. You notice a third set of buttons, with some pencil marks over them--"Press these to return to yourself 30 years"--and you begin waiting for the air to get stale. It doesn't because there is only one of you this time. Instead, everything flashes off and you're sitting in the machine in your own back yard. You'll figure out the cycle in more details later. You get into the machine in front of your house, go to the future in the sub-basement, land in your back yard, and then hop back thirty years to pick up yourself, landing in front of your house. Just that. But right then, you don't care. You jump out and start pulling out that atomic generator and taking it inside. * * * * * It isn't hard to disassemble, but you don't learn a thing; just some plates of metal, some spiral coils, and a few odds and ends--all things that can be made easily enough, all obviously of common metals. But when you put it together again, about an hour later, you notice something.