GB182499A - Improvements in and relating to half-tone process reproduction - Google Patents
Improvements in and relating to half-tone process reproductionInfo
- Publication number
- GB182499A GB182499A GB312421A GB312421A GB182499A GB 182499 A GB182499 A GB 182499A GB 312421 A GB312421 A GB 312421A GB 312421 A GB312421 A GB 312421A GB 182499 A GB182499 A GB 182499A
- Authority
- GB
- United Kingdom
- Prior art keywords
- camera
- scale
- extension
- marked
- lever
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F5/00—Screening processes; Screens therefor
- G03F5/02—Screening processes; Screens therefor by projection methods
- G03F5/06—Screening processes; Screens therefor by projection methods changing the diaphragm effect
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Indication In Cameras, And Counting Of Exposures (AREA)
Abstract
182,499. Douthitt, F. Jan. 25, 1921. Photo-mechanical printing-surfaces. - Relates to the production of a half-tone negative by a number of exposures through different stops, and consists in the provision, on the camera, of means for indicating the camera extension and of an aperture scale graduated so that any stop can be accurately set for the camera extension. In the construction shown, the camera extension is measured by a tape 40 passing over a pulley 41 and operating a pointer 16 which indicates the extension on a scale 17. The lever 9 of the iris diaphragm is set with reference to a graduated plate 10, Fig. 5, marked with scales of numbers corresponding to camera extensions for each fratio, so that when the lever is set on a selected scale, e.g. the f-16 scale, to the number indicated by the camera extension pointer 16, the diaphragm is at the correct aperture corresponding to the selected scale, i.e. f-16. A removable card 18 is marked with a table 43 giving sets of exposure times for the four stops used. A separate card is used for each screen and screen distance. Reference has been directed by the Comptroller to Specification 4914/07.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB312421A GB182499A (en) | 1921-01-25 | 1921-01-25 | Improvements in and relating to half-tone process reproduction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB312421A GB182499A (en) | 1921-01-25 | 1921-01-25 | Improvements in and relating to half-tone process reproduction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB182499A true GB182499A (en) | 1922-06-26 |
Family
ID=9752361
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB312421A Expired GB182499A (en) | 1921-01-25 | 1921-01-25 | Improvements in and relating to half-tone process reproduction |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB182499A (en) |
-
1921
- 1921-01-25 GB GB312421A patent/GB182499A/en not_active Expired
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