Use an overhead projector.
The overhead projector is a very useful adjunct to other teaching aids. It is easy to operate, flexible, and the lecturer can work it himself while facing the audience. Transparencies can be produced quickly and simply, and since they are large enough to be studied without viewing equipment, sets of transparencies can be kept in libraries for the benefit of students revising particular subjects.
Council for Postgraduate Medical Education in England and Wales, 7 Marylebone Road, London, NW1, UK.
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Essex-Lopresti