Descriptor
| Audiovisual Aids | 1 |
| Developing Nations | 1 |
| Display Aids | 1 |
| Display Systems | 1 |
| Educational Media | 1 |
| Educational Technology | 1 |
| Radio | 1 |
| Screens (Displays) | 1 |
| Television | 1 |
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Author
| Verduin-Muller, Henriette | 1 |
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Download full textVerduin-Muller, Henriette – 1972
The tele-blackboard is an audiovisual system, the core of which is a tableau on which is put a normal piece of paper. The paper is written on with a pencil that goes with the tableau, and the visual information is transformed into narrow banded signals which are sent simultaneously with a verbal explanation by normal longwave radio transmitters.…
Descriptors: Audiovisual Aids, Developing Nations, Display Aids, Display Systems
