A technical dictionary of printmaking, André Béguin.
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halftone screen
In its acceptable sense, a series of ruled, etched and pigmented lines, evenly spaced and of a definite number per inch (ranging from 50 to 400), the lines etched on two glass plates and the plates then cemented together so that the opaque lines cross eachother at right angles and form transparent aquare apertures between the intersecting lines of equal width. Halftone screens are also made with a grain formation and in the form of photographic films, the latter known as variable opacity and contact screens, and embodying a formation of halftone dots.
f. trame cristal, trame de similigravure, trame pour similigravure. d. Autotypieraster, Raster, Bildraster, n. autotypieraster, raster.
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