Oh, you went wwwwaaaaayyyyy back to one of my very first blog posts from 2008. Okay, that is not too long ago, but technologically speaking it is!
Okay, this seems prehistoric now, but because I wasn't provided one at the time, I would film a science experiment within reach of the TV, hit stop, have it plugged to the TV and hit replay so the kids could see it on the big screen. That's really about it. Hopefully, you have access to some grants for an actual document camera. The one I have now runs in real time (no delay), has screen capture, switches from laptop to projector with ease, and can swivel around to see the room, etc.
Best of luck to you!
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