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Overhead projections lend themselves easily to your needs. You don’t have to darken the room to use overhead projections, and you can continue to face your audience, maintaining direct contact with them. You can revise transparency while it is being shown, adding flexibility and spontaneity your presentation. You can use a pencil as a pointer to direct listeners’ attentions to features you want to emphasize.
To prepare materials for use as projections, you should follow the general guidelines presented earlier for the use of graphics. You should frame your transparencies to avoid glare from light showing around the outside edges the projection. Frames can be purchased at most copy shops or made from construction paper or poster board.
With traditional equipment, such as a carousel projector, you will find that slides are more difficult to handle than transparencies. Often the room has to be darkened, and the illuminated screen becomes the center of attention instead of you. When you arrange slides in a carousel, be sure that (hey are in the proper order and that none of them are upside down. Traditional slides also require specialized equipment to prepare. Today, however, many personal computers are packaged with software that allows you to prepare and present slide presentations. We will discuss this in greater detail as we discuss computer assisted presentations.