Sealed beam high-intensity short arc lamp

Claim 1

A GASEOUS DISCHARGE LAMP AND HOUSING THEREFOR IN COMBINATION, SAID DISCHARGE LAMP COMPRISING AN ELONGATE QUARTZ TUBULAR ENVELOPE HAVING A CENTRAL GASEOUS DISCHARGE SECTION BETWEEN END SECTIONS, A FIRST CONDUCTOR ROD DISPOSED AXIALLY OF THE ENVELOPE AND IN SEALED RELATION WITH ONE END OF THE ENVELOPE, SAID FIRST ROD HAVING ITS INNER END WITHIN THE DISCHARGE SECTION PROVIDING AN ANODE AND ITS OUTER END EXTERIORLY OF THE ENVELOPE, A SECOND CONDUCTOR ROD DISPOSED AXIALLY OF THE ENVELOPE AND IN SEALED RELATION WITH THE OTHER END OF THE ENVELOPE, SAID SECOND ROD HAVING ITS INNER END WITHIN THE DISCHARGE SECTION PROVIDING A CATHODE SPACED FROM SAID ANODE AND ITS OUTER END EXTERIORLY OF THE ENVELOPE, SAID HOUSING BEING FORMED OF A PARABOLIC REFLECTOR SHELL AND A LIGHT TRANSMISSIVE SHELL, SAID REFLECTOR SHELL HAVING A FIRST TUBULAR EXTENSION CENTRALLY THEREOF, SAID TRANSMISSIVE SHELL HAVING A SECOND TUBULAR EXTENSION CENTRALLY THEREOF, SAID SHELLS HAVING THEIR RIM EDGES SECURED TOGETHER POSITIONING SAID EXTENSIONS IN DIAMETRICALLY OPPOSED RELATION, SAID ENVELOPE EXTENDING AXIALLY OF THE HOUSING WITH ITS END SECTIONS DISPOSED WITHIN THE TUBULAR EXTENSIONS AND END PORTIONS OF THE CONDUCTORS DISPOSED EXTERIORLY OF THE EXTENSIONS, SECURING MEANS FIXING AND SEALING THE CONDUCTORS IN THE TUBULAR EXTENSIONS AND AN EXPANSION JOINT IN AT LEAST ONE OF SAID CONDUCTORS PERMITTING AXIAL MOVEMENT OF THE ENVELOPE RELATIVE TO THE HOUSING.