Electric lamp manufacture

Claim 1

THE METHOD OF MAKING AN ELECTRIC LAMP COMPRISING: PROVIDING A VITREOUS ENVELOPE HAVING A BULB PORTION WITH TUBULAR NECK PORTIONS ON OPPOSITE SIDE, AND A PAIR OF VITREOUS SEAL TUBES EACH HAVING AN INLEAD SEALED THROUGH A SOLID FRONT END PORTION OF THE TUBE AND A PASSAGEWAY EXTENDING FROM THE REAR END OF THE TUBE UP TO AN APERTURE BEHIND THE SOLID PORTION; INSERTING THE SOLID PORTIONS OF THE SEAL TUBES INTO SAID NECK PORTIONS; APPLYING HEAT TO FORM HERMETIC JUNCTURES BETWEEN THE ENDS OF THE NECK PORTIONS AND THE SEAL TUBES AT POINTS BEYOND SAID APERTURES WHILE FLUSHING INACTIVE GAS THROUGH THE SEAL TUBES TO PREVENT OXIDATION OF THE INLEADS; COLLECTING A DESIRED QUANTITY OF A DISCHARGE SUPPORTING MEDIUM WITHIN THE BULB PORTION BY FLUSHING INACTIVE GAS IN WHICH SAID MEDIUM IS ENTRAINED THROUGH THE ENVELOPE WHILE CHILLING THE BULB PORTION IN ORDER TO CONDENSE THE MEDIUM WITHIN IT; APPLYING HEAT TO SEAL OFF THE SEAL TUBES AT POINTS BEYOND SAID HERMETIC JUNCTURES; AND APPLYING HEAT TO THE NECK PORTIONS TO COLLAPSE THEM ONTO SAID SOLID PORTIONS AND FUSE THE PORTIONS TOGETHER INTO SOLID VITREOUS NECKS.