Patent model for printing photomechanical plates

Description (Brief)
This patent model demonstrates an invention for methods of making photomechanical or other prints resemble original photographs. The invention was granted patent number 493850.
Tonal photomechanical reproductions had an objectionable coarseness because of the perceptible pattern of the halftone screen. By this invention, screened plates-either bearing an image or blank-were printed several times slightly out of register with each other, softening the effect of the screen. The key impression of the image would be made first in a dark ink with a heavy body, and then the other impressions in paler or lighter-bodied inks. To imitate sepia photographs, later impressions were made in brown tinted inks.
Currently not on view
date made
ca 1893
patent date
Woodward, Charles B.
Physical Description
paper (overall material)
part:small photos: 10.8 cm x 16.5 cm x .1 cm; 4 1/4 in x 6 1/2 in x 1/16 in
part:large photos: 27.4 cm x 34 cm x .1 cm; 10 13/16 in x 13 3/8 in x 1/16 in
ID Number
patent number
accession number
catalog number
See more items in
Culture and the Arts: Graphic Arts
Industry & Manufacturing
Patent Models
Patent Models, Graphic Arts
Data Source
National Museum of American History