Projector for slides mounted in collective frame - held on projector rails for motorised horizontal and vertical movement giving speedy change

摘要

A projector is for transparencies in rows across and vertically in a large frame. The advantage is that a complete magazine of slides can be accommodated on one frame and projected. The projector can change quickly from slide to slide. The frame comprises holders X for individual slides which may be held in vertical or horizontal format. The frame is held on rails in the projector for motorised horizontal or vertical movement. The operator can easily move from one slide to another speedily either in sequence or at random which is of special advantage in educational establishments.