Thanks, Dr. Pat, for your earlier article reminding me how much people like to read about engineering and invention.

It all seems so simple today. Put a document in machine, push a few buttons, and out come as many identical copies as you want. Or send a computer file to a laser or dot-matrix printer, and the machine spits out as many originals as you would like of a document that never before existed in tangible form.

That's xerography, a word meaning dry writing, coined by Chester Carlson for his invention of electro-photographic imaging. As David Owen writes in his engrossing new book, Copies in Seconds, Carlson began developing the idea in a makeshift laboratory in a rented former janitor's closet in Astoria, Queens. There on October 22, 1938, Carlson and his assistant, Otto Kornei, produced the first Xerox copy in a cumbersome step-by-step process that evokes a mental image of a Rube Goldberg cartoon.

Kornei, whose pay included a share of the invention's future profits, soon gave up to take another job. In what must rank as one of the worst business deals in history, he exchanged his rights to earnings from Carlson's invention for the unencumbered opportunity to develop one of his own.

Carlson understood that xerography faced tremendous obstacles before it could be commercialized. But he was also a visionary and staked out claims in his patents that included the technology's most significant commercial applications. He then set out to find an organization to share the risk and to manufacture electro-photographic equipment.

In 1944, he found an interested research group at the nonprofit Battelle Memorial Institute in Columbus, Ohio. Four years later, a relatively small manufacturing company, the Haloid Corporation in Rochester, New York, committed resources to build the first commercial xerographic imaging machine.

It was a good thing that the Haloid executives didn't know the problems they were letting themselves in for, or they never would have invested in Carlson's scheme. Their stockholders would never have accepted the risks the company had to take to produce the Xerox 914, an unwieldy machine that succeeded beyond all expectations.

Haloid became known as Haloid-Xerox and then simply the Xerox Corporation. Meanwhile, Chester Carlson, who had nurtured dreams of becoming an inventor while growing up in unimaginable poverty, achieved unimaginable wealth. But though he enjoyed the travel and creature comforts that riches provided, he had no interest in high living. He declared that his next goal was to die a poor man.

But that goal was impossible for a man like Chester Carlson to achieve. No matter how much of his money he managed to give away, the inventor of xerography remained enriched by faith and character. He died quietly in 1968, just short of 60 years old and content in the knowledge that his life's work had profoundly changed the world.

Physicist Fred Bortz is the author of numerous children's science books, and winner of the American Institute of Physics Science Writing Award.

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Coming to BlogCritics on April 18, the fiftieth anniversary of Einstein's death: My review of Driving Mr. Albert: A Trip Across America with Einstein's Brain.

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