Combination incinerator and draft control apparatus

Claim 1

IN COMBINATION: AN INCINERATOR COMPRISING AN UPSTANDING HOUSING HAVING A TOP WALL, AND STRUCTURE DEFINING A COMBUSTION CHAMBER WITHIN SAID HOUSING AND A COMMUNICATING FLUE EXTENDING UPWARDLY THROUGH SAID TOP WALL; AND A DRAFT CONTROL UNIT CARRIED BY SAID TOP WALL AND COMPRISING AN UPSTANDING TUBULAR METAL CASING SURROUNDING THE TOP END OF SAID FLUE, AN UPSTANDING TUBULAR REFRACTORY LINER ARRANGED IN SUPPORTED POSITION WITHIN SAID CASING AND ALSO SURROUNDING THE TOP END OF SAID FLUE, SAID LINER INCLUDING A LOWER SECTION HAVING A SUBSTANTIALLY CYLINDRICAL INNER SURFACE AND AN INTERMEDIATE SECTION HAVING A SUBSTANTIALLY FRUSTO-CONICAL INNER SURFACE AND AN UPPER SECTION ALSO HAVING A SUBSTANTIALLY FRUSTO-CONICAL INNER SURFACE, THE INNER SURFACE OF SAID INTERMEDIATE LINER SECTION EXTENDING UPWARDLY AND INWARDLY FROM THE TOP OF THE INNER SURFACE OF SAID LOWER LINER SECTION, THE INNER SURFACE OF SAID UPPER LINER SECTION EXTENDING UPWARDLY AND OUTWARDLY FROM THE TOP OF THE INNER SURFACE OF SAID INTERMEDIATE LINER SECTION AND DEFINING IN SAID UPPER LINER SECTION AN UPWARDLY DIVERGING EXHAUST CHAMBER HAVING AN OUTLET OPENING THEREFROM AT THE TOP END OF SAID UPPER LINER SECTION, AN UPSTANDING METAL TUBE ARRANGED IN THE LOWER PORTION OF SAID LINER AND HAVING AN OPEN BOTTOM END SEALED BOTH TO THE TOP END OF SAID FLUE AND TO THE BOTTOM OF THE INNER SURFACE OF SAID LOWER LINER SECTION AND HAVING AN OPEN TOP END TERMINATING WITHIN SAID INTERMEDIATE LINER SECTION, SAID TUBE HAVING A FRUSTO-CONICAL CONFIGURATION AND EXTENDING UPWARDLY AND INWARDLY FROM THE BOTTOM END THEREOF TO THE TOP END THEREOF, WHEREBY SAID TUBE DEFINES AN UPWARDLY CONVERGING PASSAGE THERETHROUGH COMMUNICATING AT THE LOWER END THEREOF WITH THE TOP END OF SAID FLUE, THE INNER SURFACE OF SAID LOWER LINER SECTION SURROUND-