Notes on the arrangement of visual equipment:
(1) Visual equipment should be quickly and easily handled.
(2) In using visual materials, stand near the pictures, but not close enough to interfere with the view of the audience. Do not stand near the lantern.
(3) The signal for change of picture should be simple. A visual signal is much better than an audible one. A competent operator can easily watch the lecturer for some movement of the hand or for a partially concealed flash from an electric torch.
(4) Motion pictures can seldom be used effectively during a talk. Usually they are better when used as a review of the subject after the lecture.
(5) when possible use slides from the beginning of the lecture. Frequently, however, it will be desirable to present only a small series of slides at the end of the lecture in order to accentuate the main points brought out during the talk.
The principle of variety is important in selecting the slides to be used in illustrating a lecture. The lecturer should study his illustrative material; some pictures require explanation, while others are most effective when viewed in silence. Frequently it is necessary to talk for a few minutes without slides.
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