Patent model for printing photomechanical plates
date: label: date made
content: ca 1893
label: patent date
content: 1893-03-21
name: label: patentee
content: Woodward, Charles B.
notes: label: Description (Brief)
content: This patent model demonstrates an invention for methods of making photomechanical or other prints resemble original photographs. The invention was granted patent number 493850.
label: Description (Brief)
content: 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.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Graphic Arts
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content: Patent Models, Graphic Arts
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content: Work
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content: Communications
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content: Industry & Manufacturing
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content: Patent Models
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: GA.89797.493850
label: patent number
content: 493850
label: accession number
content: 089797
label: catalog number
content: GA*89797.493850
objectType: label: Object Name
content: process, photomechanical plate printing
label: Object Name
content: Plate
label: Object Name
content: photomechanical (engraving) printing plate
label: Object Name
content: photomechanical printing plate
label: Object Type
content: plate
label: Object Type
content: Patent Model
physicalDescription: label: Physical Description
content: paper (overall material)
label: Measurements
content: 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
label: Measurements
content: 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