From the Greek xeros, meaning dry, and graphos, meaning written. Also known as electropho-tography. A process for copying material through the production of photographic images.The latent image is transferred by the action of light on a photoconductive insulated drum to which the image attracts oppositely charged dry ink particles that are then fused in place on paper. The process was invented and patented in 1938 by Chester Carlson (1906