Projection apparatus and film magazine therefor

Claim 1

PROJECTION APPARATUS, COMPRISING: SUPPORT STRUCTURE INCLUDING AN UPRIGHT, HOLLOW MOUNTING ELEMENT HAVING FRONT AND REAR AND OPPOSITE SIDE WALLS, TWO OF SAID WALLS BEING PARALLEL AND SAID REAR WALL HAVING AN APERTURE THEREIN; AN OPTICAL SYSTEM ON SAID STRUCTURE, INCLUDING A PART EXTERNALLY OF AND A PART WITHIN SAID ELEMENT, FOR TRANSMITTING LIGHT THROUGH SAID APERTURE; A FILM MAGAZINE HAVING INTERIOR UPRIGHT WALLS DEFINING AN OPENING THEREIN DIMENSIONED AND SHAPED TO RECEIVE SAID ELEMENT, AN OPPOSED PAIR OF SAID MAGAZINE WALLS BEING PARALLEL AND SPACED APART ON THE ORDER OF AND COOPERATIVE WITH THE AFORESAID PARALLEL WALLS OF THE ELEMENT TO LOCATE THE MAGAZINE ON THE ELEMENT AND TO PROVIDE FOR SLIDABLE DOWNWARD MOUNTING OF SAID MAGAZINE ON SLIDABLE AND UPWARD REMOVAL THEREOF FROM SAID ELEMENT, SAID MAGAZINE WHEN MOUNTED HAVING A REAR PART CLOSELY BEHIND THE ELEMENT REAR WALL AND FIRST AND SECOND SIDE PARTS RESPECTIVELY AT