GB538782A - A new or improved mask for use in the art of photography - Google Patents
A new or improved mask for use in the art of photographyInfo
- Publication number
- GB538782A GB538782A GB620840A GB620840A GB538782A GB 538782 A GB538782 A GB 538782A GB 620840 A GB620840 A GB 620840A GB 620840 A GB620840 A GB 620840A GB 538782 A GB538782 A GB 538782A
- Authority
- GB
- United Kingdom
- Prior art keywords
- photography
- new
- art
- width
- angular
- 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
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B27/00—Photographic printing apparatus
- G03B27/32—Projection printing apparatus, e.g. enlarger, copying camera
- G03B27/52—Details
- G03B27/58—Baseboards, masking frames, or other holders for the sensitive material
- G03B27/582—Baseboards, easels
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Holders For Sensitive Materials And Originals (AREA)
- Projection-Type Copiers In General (AREA)
Abstract
538,782. Photographic enlarging masks. HARRISON, H. W. April 5, 1940, No. 6208. [Class 98 (i)] An adjustable mask for use in selection of a portion of a photographic or other pictorial representation for reproduction on the same or a different scale comprises two movable angular members A, B, each having an open angular recess R, or R<SP>1</SP> in one of its sides, with means D, E for guiding them over one another so that the angular recesses co-operate to provide an aperture variable in size but preserving a pre-determined ratio between its length and width. The guide ways may be angularly adjustable to change the ratio between the length and width of the aperture.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB620840A GB538782A (en) | 1940-04-05 | 1940-04-05 | A new or improved mask for use in the art of photography |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB620840A GB538782A (en) | 1940-04-05 | 1940-04-05 | A new or improved mask for use in the art of photography |
Publications (1)
Publication Number | Publication Date |
---|---|
GB538782A true GB538782A (en) | 1941-08-15 |
Family
ID=9810387
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB620840A Expired GB538782A (en) | 1940-04-05 | 1940-04-05 | A new or improved mask for use in the art of photography |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB538782A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3119799A (en) * | 1955-03-18 | 1964-01-28 | Montedison Spa | Polymers of acetylenic hydrocarbons and methods for producing the same |
EP0160101A1 (en) * | 1983-10-26 | 1985-11-06 | Hiroto Wakamatsu | Ruler for trimming |
-
1940
- 1940-04-05 GB GB620840A patent/GB538782A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3119799A (en) * | 1955-03-18 | 1964-01-28 | Montedison Spa | Polymers of acetylenic hydrocarbons and methods for producing the same |
EP0160101A1 (en) * | 1983-10-26 | 1985-11-06 | Hiroto Wakamatsu | Ruler for trimming |
EP0160101A4 (en) * | 1983-10-26 | 1986-04-02 | Hiroto Wakamatsu | Ruler for trimming. |
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