Overhead Projector 📽️ Teaching Before PowerPoint
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Overhead Projector 📽️ Teaching Before PowerPoint
Before digital projectors, smartboards, and PowerPoint presentations, classrooms used overhead projectors. Teachers placed transparent sheets called transparencies on a glass surface. A bright lamp inside the projector shined through the sheet, projecting the image onto a screen for the whole class to see. This simple but powerful technology ...
819 views4 months ago
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