Xerography and electrostatic printing

Summary :

Xerography or electrophotography is a high speed electronic image-forming process which is the physical counterpart of chemical photography with a significant future in radiography, cartography and the graphic sciences. Plates and papers are coated with photo-conductive films of amorphous selenium or a metal salt, or an insulative resin. The electronic images formed on these films arc developed with dry powders or colloidal suspensions. The images may be transferred for permanent recording and the plates used repeatedly. The advantages of xerography include high resolving power, very rapid controlled development in any colour, over-printing capacity, and low cost.—Based on a lecture to the South Australian Section on November 4, 1957.