Abstract: There is provided a projector comprising a dia projection system and a film projection system. The main lens system and the light source of the projector are common for the two projection systems. A link mechanism connects the not common parts of the two projection systems. By moving one member of one of the systems transverse to the projector the members of the other system are brought into alignment with the light source and main lens system of the projector and vice versa. The alignment is determined by the two end positions of the link mechanism.

Abstract: Bundles of paper, or the like, are conveyed along a horizontal table from which they pass onto a downwardly inclined table arranged at the end of the horizontal table. The bundles slide down this inclined table into the hopper where they are collected. A pin is mounted in the vicinity of the downwardly inclined table for reciprocating movement through an aperture in the table. The pin and aperture are arranged so as to lie a certain distance from the path of travel of the center of gravity of the bundles so that when the pin is translated through the aperture to interrupt the path of every second bundle, it causes the bundle to rotate by 90 degrees and thereby form a crosswise laying of the bundles in the collection hopper. The aperture through which the pin extends can be in the form of a hole, or of a slot through which the pin is rotated.