positive (black on white) or negative (white on black) reproduction of printed matter or artwork made on a photostat machine, which uses photographic paper instead of a transparent negative, and uses a prism to render the paper negative readable instead of reversed
a duplicating machine that makes quick positive or negative copies directly on the surface of prepared paper a photocopy made on a Photostat machine make a copy by means of a Photostat device
A photostat is a particular type of photocopy. a photostat of the actual script. a photographic copy of a document, or a type of machine used for making one