A humble project to improve carbon copying has spawned a whole family of technical advances and is still reproducing wildly. It may even end by simulating the structure of the human brain.
The take-off point, says Robert G. Chollar, research chief of the National Cash Register Co. at Dayton, was a trick paper coated with clay on one side and with a special colorless ink on the other side. When the sheets were superimposed and written or typed on, the clay and ink were forced into contact. The ink turned deep blue, making a "carbon copy" without carbon, but the paper was...
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