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 ...

Overhead projectors use a bright lamp and mirrors to display text or images from a transparency sheet on a wall or screen. If your projector displays a shadow when projecting, you must troubleshoot ...