Photographic projection system and lamp

Claim 1

IN A PHOTOGRAPHIC PROJECTION SYSTEM INCLUDING MEANS PROVIDING A FILM APERTURE, A PROJECTION LENS IN FRONT OF SAID APERTURE AND LIGHT PROJECTING MEANS BEHIND SAID APERTURE FOR CONCENTRATING A BEAM OF LIGHT THERETHROUGH, SAID LIGHT PROJECTING MEANS COMPRISING A COMPACT LAMP UNIT INCLUDING A CONCAVE LIGHT-CONCENTRATING REFLECTOR OF GLASS HAVING THEREON A MULTIPLE LAYER INTERFERENCE FILM WHICH REFLECTS LIGHT AND TRANSMITS HEAT, SAID REFLECTOR FACING SAID APERTURE AND HAVING AN ANNULAR FLANGE AT ITS RIM AND AN OPENING AT ITS APEX, A BASE MEMBER ATTACHED FIXEDLY TO THE BACK OF SAID REFLECTOR AT THE MARGIN OF SAID OPENING, SAID BASE MEMBER HAVING OPPOSITE FLAT SIDES DEFINING A NARROW LATERAL BASE DIMENSION, A LIGHT SOURCE COMPRISING AN UNBASED COMPACT MINIATURE LAMP BULB CONTAINING A TUNGSTEN FILAMENT AND SUPPORTED FIXEDLY IN SAID BASE WITH ITS FILAMENT LOCATED IN SAID REFLECTOR IN FIXED PREDETERMINED ACCURATE RELATIONSHIP TO THE FOCUS THEREOF AND TO THE SAID FLANGE, SAID BUBL CONTAINING A HALOGEN FOR OPERATION OF A TUNGSTEN-HALOGEN REGENERATIVE CYCLE WHICH MAINTAINS SAID COMPACT BULB FREE FROM BLACKENING, CONTACT MEMBERS AT THE REAR OF SAID BASE ELECTRICALLY CONNECTED TO THE FILAMENT OF SAID LAMP BULB, SUPPORT MEANS INCLUDING AN ANNULAR SEATING SHOULDER PORTION LOCATED IN FIXED PREDETERMINED ACCURATE RELATIONSHIP TO SAID FILM APERTURE AND ENGAGEABLE WITH THE SAID FLANGE ON SAID REFLECTOR, MEANS HOLDING SAID REFLECTOR FLANGE SECURELY AGAINST SAID SEATING SHOULDER WITH SAID REFLECTOR AND LIGHT SOURCE IN ACCURATE PREDETERMINED RELATIONSHIP TO SAID FILM APERTURE, AND INDEXING MEANS CARRIED BY SAID SUPPORTING MEANS AND ENGAGING THE SAID FLAT SIDES OF SAID BASE MEMBER TO ORIENT THE LAMP UNIT IN A PREDETERMINED ANGULAR POSITION.