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Used in the late 1800's - Projected images on glass slides. Chicago public schools used about 8000 of these through WWI. Used oil lamps or candles.
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Show educational films in classrooms. Could stop mid film to have discussions or review material.
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Roger Appledorn (with 3M) created for work within business and education. Became more popular late 70's - 90's. Low cost interactive educational tool. Easier for educators to use - better than writing on chalk boards. Can use pre-printed transparencies or use blank ones - writing with an erasable marker.
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Modern update for the filmstrip. Allowed educators to have better, more reliable method for incorporating films into their educational plans.
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New technology allowed for the advancement of displaying material onto a screen. Similar to the overhead projector, but allows the educator to display a 3D image if needed. Can also be used to display forms, papers, articles, etc...
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Initially used with Macintosh computers only for business related presentations. Became part of Microsoft Office in 1989 and has continued to grow. Initially used to help create overhead transparencies and then 35mm slides. Now used widely for all types of presentations.
