Halide leak detector

Claim 1

A HALIDE GAS DETECTOR COMPRISING: MEANS DEFINING A BURNER TUBE ASSEMBLY INCLUDING A PRIMARY TUBE AND HAVING A LONGITUDINAL BORE WITH AN OPENING AT ONE END OF THE TUBE ASSEMBLY FOR RECEIVING A BURNER MEANS AND AN OPENING AT THE OTHER END FOR RECEIVING FUEL GAS FROM A SOURCE, BURNER MEANS IN SAID ONE END OF THE TUBE PROVIDING A CENTRAL PRIMARY FLAME OPENING AND AN ANNULAR SECONDARY FLAME OPENING SURROUNDING SAID CENTRAL FLAME OPENING, A CYLINDRICAL COLLAR SUROUNDING AND FREELY ROTATABLY MOUNTED ON THE PRIMARY TUBE INTERMEDIATE THE ENDS THEREOF, SAID COLLAR HAVING A CIRCUMFERENTIAL GROOVE ON ITS INNER FACE AND DEFINING WITH A PORTION OF THE OUTER PERIPHERY OF THE PRIMARY TUBE AN ANNULAR PASSAGE, THE PRIMARY TUBE HAVING A BORE FORMING PART OF SAID LONGITUDINAL BORE AND A PLURALITY OF SPACED RADIAL PASSAGES EXTENDING THROUGH ITS WALL TO CONNECT THE ANNULAR PASSAGE AND THE ASSEMBLY BORE, MEANS ON SAID TUBE ASSEMBLY ON EITHER SIDE OF SAID COLLAR FOR PREVENTING LONGITUDINAL MOVEMENT THEREOF ALONG THE PRIMARY TUBE, MEANS SEALING SAID COLLAR TO THE ADJACENT PART OF THE TUBE TO PREVENT LEAKAGE AROUND SAID COLLAR, SAID COLLAR HAVING AN INLET PORT LEADING TO SAID ANNULAR PASSAGE AND MEANS CONNECTED TO THE INLET PORT FOR INTRODUCING THROUGH SAID PASSAGE INTO THE BORE A SAMPLE OF THE ATMOSPHERE TO BE MIXED WITH FUEL GAS FLOWING THROUGH THE BORE FROM THE SOURCE TOWARD THE BURNER MEANS, AND REACTIVE MEANS DISPOSED ADJACENT SAID BURNER MEANS AND ADAPTED TO CAUSE A COLOR CHANGE IN THE FLAME IF A HALIDE IS PRESENT IN SAID SAMPLE OF ATMOSPHERE.