photostat

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photostat

(fō`təstăt'), reproduction of any printed or simple black-and-white material, such as drawings or manuscripts, made by the Photostat, a photographic camera. While slower and more expensive than xerographyxerography
, also called electrophotography, method of dry photocopying in which the image is transferred by using the attractive forces of electric charges. A beam of light, usually from a laser, is made to strike the original material, e.g., a white page with black lettering.
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, the process is still used where a high degree of resolution is desired, as in publishing.
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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Photostat

 

a device used to make photographic copies of two-dimensional originals—blueprints, drawings, and similar documents; it consists of a camera, lighting fixtures, and attachments for holding the original. A Photostat is capable of producing enlarged, reduced, or identical copies on roll photographic paper (ordinary or reversal). Photostats are usually produced in unit with devices for the automatic chemical processing of the photocopies.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.