A helpful innovation for overhead projectors with built-in lamps/reflectors is the quick-swap twin-lamp control, allowing two lamps to be installed within the projector in movable sockets. A disadvantage of that technology is the warm up time required for such lamps. When the transparency sheet is full of written or drawn materials, it may possibly merely be changed with a brand new, fresh sheet with more pre-printed materials, once more saving class time vs a blackboard that would have to be erased and instructing supplies rewritten by the educator.
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