Identifier: halftoneprocessp00verf (find matches)
Title: The half-tone process. A practical manual of photo-engraving in half-tone on zinc, copper, and brass
Year: 1904 (1900s)
Authors: Verfasser, Julius
Subjects: Photoengraving
Publisher: London, Iliffe & sons, limited
Contributing Library: Getty Research Institute
Digitizing Sponsor: Getty Research Institute

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Fig. 7. of good screens are sharp and clear under a magnifyingpower of 100 diameters. It was formerly the practiceto use a single line plate, and to reverse the directionof the ruling by turning the plate a quarter revolutionduring the exposure, but this method is now obsolete. Screens formed of circular dots instead of lines havealso been tried, but abandoned by all practical workers.
Text Appearing After Image:
HALF-TONE MADE ETCHED ON COPPER WITH MAX LEVYS BY THE ENAMEL 400 LINE SCREEN. PROCESS BY THE WALKER ENGRAVING CO. NEW YORK. THE SCREEN. -5 Grained screens and chess-hoard screens offermore promising alternatives to the half-tone screen,but at the time of writing they have not come intocommercial use. The old plan by which the operator made his screensby copying the proof from a copper plate engravedwith parallel lines has also been quite superseded, asalso the clumsy makeshift of using wire gauze, silk net,muslin, crape, or tulle. The choice of a screen really becomes a simplematter, owing to the limited number of makers. Levy,of Philadelphia, U.S.A., and Wolfe, of Dayton, Ohio,U.S.A., are the oldest established ones ; but very goodscreens of a similar character were put on themarket recently by Johnson, of Leicester, and Haas,of Frankfurt-on-the-Main. The author knows of noother screen makers of importance. Levy screens have undoubtedly the highest reputa-tion, and are the most exten

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