As with a lot of classroom tech, overhead projectors declined in use as more high-tech options for classroom visual aids became available. In the 1980s, data projectors that could be connected to a TV ...

An interpretative study of these data has been published by ... of teaching with motion pictures and other visual aids and improvement of the 16 mm. projector so as to make it easier for amateurs ...

The Delhi government launched the first of its 54 model schools, which has audio-visual teaching aids, projectors in classrooms and a swanky building on Wednesday. Students practice at a new gym ...