There wasn’t anything underneath but clouds, and there wasn’t anything overhead but sky. Joe Kenmore looked out the plane window past the co-pilot’s shoulder. He stared ahead to where the sky and cloud bank joined—it was many miles away—and tried to picture the job before him. Back in the cargo space of the plane there were four big crates. They contained the pilot gyros for the most important object then being built on Earth, and it wouldn’t work properly without them. It was Joe’s job to take that highly specialized, magnificently precise machinery to its destination, help to install it, and see to its checking after it was installed. He felt uneasy. Of course the pilot and co-pilot—the only two other people on the transport plane—knew their stuff. Every imaginable precaution would be taken to make sure that a critically essential device like the pilot gyro assembly would get safely where it belonged. It would be—it was being—treated as if it were a crate of eggs instead of massive metal, smoothed and polished and lapped to a precision practically unheard of. But just the same Joe was worried. He’d seen the pilot gyro assembly made. He’d helped on it. He knew how many times a thousandth of an inch had been split in machining its bearings, and the breath-weight balance of its moving parts. He’d have liked to be back in the cargo compartment with it, but only the pilot’s cabin was pressurized, and the ship was at eighteen thousand feet, flying west by south....