File:The American annual of photography (1919) (14782542335).jpg

Identifier: americanannualof3334newy (find matches)
Title: The American annual of photography
Year: 1919 (1910s)
Authors:
Subjects: Photography
Publisher: New York : Tennant and Ward
Contributing Library: Harold B. Lee Library
Digitizing Sponsor: Brigham Young University

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after the negativehas been developed the grain on the positive is obtained by in-terposing the film screen in the positive printing frame betweenthe negative and the positive plate. Second: With this process it is not necessary to have anegative glass plate. The negative from which the positive isto be grained can also be on a film if so desired to preventbreakage, or for any other reason. Third: The screen on glass must be ruled with great pre-cision and pains, and for that reason glass screens are veryexpensive, besides they wear out after a while from rubbingor manipulating and of course breakage. This is obviated bythe film screen. Fourth: The film screens can be made by any one them-selves where and when required, and any size of grain, whilethe glass screens are so difficult to make that only people whomake a specialty of it can make them, and it is well knownthat there are only comparatively few manufacturers whomake them, in fact there is I believe only one kind of screen 128
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4) SiuV N B W wo H & O a CO > o 1-1 w almost universally in use—that is the Levy screen, so calledafter the manufacturer. Fifth: This method eliminates the necessity of making acopy from the original in the process camera, as the stippledpositive is made in the printing frame from the original withthe aid of the film screen directly. Sixth: Any shape or form of graining can be obtained withthese film screens, only depending on the original subjects fromwhich they are photographed, while glass screens are of courseto a certain extent limited in design because they are etchedor cut into the glass mechanically. Seventh: Two film screens of different patterns could besuperposed over each other and together interposed betweenthe negative and positive plate and in that way still differentsurface interruptions could be secured. Eighth: As everybody can make their own screens they canbe made any size or shape desired, especially as they can betrimmed. When the broken effect in former

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