GB344182A - Improvements in or relating to optical-projection apparatus - Google Patents
Improvements in or relating to optical-projection apparatusInfo
- Publication number
- GB344182A GB344182A GB464730A GB464730A GB344182A GB 344182 A GB344182 A GB 344182A GB 464730 A GB464730 A GB 464730A GB 464730 A GB464730 A GB 464730A GB 344182 A GB344182 A GB 344182A
- Authority
- GB
- United Kingdom
- Prior art keywords
- writing
- optical
- projection apparatus
- stylus
- paint
- 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
- G03B21/132—Overhead projectors, i.e. capable of projecting hand-writing or drawing during action
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Projection Apparatus (AREA)
- Illuminated Signs And Luminous Advertising (AREA)
Abstract
344,182. Changing signs. BELL, L.H. BAINBRIDGE-, Norfolk Villa, Montagu Road, Datchet, Buckinghamshire. Feb. 11, 1930, No. 4647. [Class 3 (i).] Optical-projection apparatus.- Writing or the like whilst being effected on one side of a surface is projected by reflection from the other side. The writing may be executed with ink or paint on an opal glass plate, or by a stylus on a plate previously coated with white paint. In one arrangement the writing screen E, Fig. 2, is placed over an aperture D in the upper surface of the box A, and is reflected thence on to a viewing screen K of translucent material. A polished ball on the stylus, or alternatively an electric torch, forms a pointer. An alternative arrangement is described more especially for lecture purposes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB464730A GB344182A (en) | 1930-02-11 | 1930-02-11 | Improvements in or relating to optical-projection apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB464730A GB344182A (en) | 1930-02-11 | 1930-02-11 | Improvements in or relating to optical-projection apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB344182A true GB344182A (en) | 1931-03-05 |
Family
ID=9781144
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB464730A Expired GB344182A (en) | 1930-02-11 | 1930-02-11 | Improvements in or relating to optical-projection apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB344182A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2484379A (en) * | 1947-09-16 | 1949-10-11 | Herman S Goldberg | Image projection system for speakers' stands |
| US4912751A (en) * | 1987-05-13 | 1990-03-27 | Didier Leclercq | Method and device for establishing and writing a luminous pattern |
-
1930
- 1930-02-11 GB GB464730A patent/GB344182A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2484379A (en) * | 1947-09-16 | 1949-10-11 | Herman S Goldberg | Image projection system for speakers' stands |
| US4912751A (en) * | 1987-05-13 | 1990-03-27 | Didier Leclercq | Method and device for establishing and writing a luminous pattern |
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