In The Overhead Projector: Don’t Overlook It (Part 1), I explained why it’s better to use a projector (be it an old-fashioned overhead or LCD) than to write on the board. Now we turn to how to use a ...
Placing a Plexiglas block on top of a mark on an overhead projector decreases the apparent depth of the mark. Turn on the projector and put the transparency on it. Focus the projector. Put the block ...
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