(under subclass 103) Subject matter wherein the carrier is moved to position the slides in the projection path so that the slides remain attached to the carrier before, during and after projection as opposed to being moved from a magazine before projection and to a magazine after projection.
(1) Note. In this subclass most of the patents are to a drum or cylindrical carrier having a circular wall to which slides are attached and on which the slides remain during the projection cycle. The projection lamp is usually mounted inside the drum or cylinder so that as the cylinder is rotated the slide between the lamp and the viewing screen is projected on the screen.
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4, for slide changing by rising, heated air.
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40, Card, Picture, or Sign Exhibiting,
361, for similar slide-moving mechanism in viewers.
