The Idea Factory: Bell Labs and the Great Age of American Innovation

by Jon Gertner

Pfann had returned to his office after lunch—“I put my feet on my desk and tilted my chair back to the window sill for a short nap, a habit then well established,” he recalled. He had scarcely dozed off when he suddenly awoke with a solution. “I brought the chair down with a clack I still remember,” he said.43 Pfann envisioned passing a molten zone—a coil of metal, in effect, creating a superheated ring—along the length of a rod of germanium; as the ring moved, it would strafe the impurities out of the germanium. Kelly would eventually tell people that Pfann’s idea—it was called “zone refining,” and was an ingenious adaptation of a technique metallurgists had used on other materials—ranked as one of the most important inventions of the past twenty-five years. Kelly didn’t tell people it resulted from a man sleeping on the job.