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Xerography

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How do Photo Copiers Work | How Stuff Works | How Devices Work in 3D | Science For Kids

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Xerography (or electrophotography)

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How photocopiers work

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How A Photocopier Works

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Xerography - Inventions & Discoveries | Educational Videos For Kids

Xerography or electrophotography is a dry photocopying technique. Its fundamental principle was invented by American physicist Chester Carlson and based on Hungarian physicist Pál Selényi's publications. Chester Carlson applied for and was awarded U.S. Patent 2,297,691 on October 6, 1942. The technique was originally called electrophotography. It was later renamed xerography—from the Greek roots ξηρός xeros, "dry" and -γραφία -graphia, "writing"—to emphasize that, unlike reproduction techniques then in use such as cyanotype, this process used no liquid chemicals.
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