The audio-visual handbook (1942)

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82 The Audio-Visual Handbook it is possible for the teacher to operate it at the front of the room, thus facing the class and facing the slide although the image itself is projected over the head of the instructor against a screen at the Photo Courtesy Spencer Lens Co. A Lecture Table or "Overhead" Projector front of the room. This outfit is not recommended ordinarily in those situations where portability is desired, for it is rather difficult to move the screen from place to place and suspend it at the proper angle for clearest projection. Many instructors in colleges and universities have found this lecture-table type of lantern to be especially satisfactory as it can be adapted to so many useful purposes. In some instances it can be used in medium-sized auditoriums for lecture demonstrations, thus avoiding the necessity of arranging a system of signals between the lecturer and the operator. Combination Equipment. There are numerous combinations of projection equipment, some of which may prove to be desirable under the proper circumstances. For example, a standard glass-slide projector may be purchased at $70; a filmslide attachment may be added