GB185395A - Improvements in or relating to optical projection apparatus - Google Patents
Improvements in or relating to optical projection apparatusInfo
- Publication number
- GB185395A GB185395A GB17453/22A GB1745322A GB185395A GB 185395 A GB185395 A GB 185395A GB 17453/22 A GB17453/22 A GB 17453/22A GB 1745322 A GB1745322 A GB 1745322A GB 185395 A GB185395 A GB 185395A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relating
- projection apparatus
- optical projection
- optical
- projection
- 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
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/08—Projectors or projection-type viewers; Accessories therefor affording epidiascopic projection
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE185395X | 1921-08-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB185395A true GB185395A (en) | 1923-04-05 |
Family
ID=5719423
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB17453/22A Expired GB185395A (en) | 1921-08-29 | 1922-06-24 | Improvements in or relating to optical projection apparatus |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB185395A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4719547A (en) * | 1986-09-19 | 1988-01-12 | Minnesota Mining And Manufacturing Company | Illumination system for overhead projector |
-
1922
- 1922-06-24 GB GB17453/22A patent/GB185395A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4719547A (en) * | 1986-09-19 | 1988-01-12 | Minnesota Mining And Manufacturing Company | Illumination system for overhead projector |
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