Remember the old days when teachers put a piece of paper on an overhead and projected it on a wall or screen? This is still done with document cameras.
Document cameras can connect directly to a projector or laptop and project on a screen. Advantages with the new system is that images can be stored, manipulated and/or emailed.
There are also fixed ceiling document cameras. They flush mount into a ceiling and take a snap shot usually to a table. This is handy for large drawings and schematics.
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