Electrical precipitators

Claim 1

AN ELECTRICAL PRECIPITATOR COMPRISING AN INSULATOR HAVING A CYLINDRICAL TOP PORTION AND AN OUTWARDLY FLARING BOTTOM PORTION; A METAL CYLINDER HAVING A TOP PORTION OF SMALLER DIAMETER THAN THE MAIN BODY PORTION OF SAID CYLINDER WITH SLOPING SIDES CONNECTING THE TWO; MEANS FOR FASTENING SAID TOP PORTION TO THE BOTTOM OF SAID INSULATOR WITH THE CYLINDRICAL PORTONS OF SAID INSULATOR AND SAID METAL CYLINDER HAVING A COMMON AXIS; A METAL SHELL SURROUNDING SAID METAL CYLINDER AND HAVING A CYLINDER SURFACE SPACED FROM THE CYLINDRICAL SURFACE OF SAID METAL CYLINDER AND ARRANGED CONCENTRIC THEREWITH AND PROJECTING ABOVE THE MAIN BODY PORTION OF SAID METAL CYLINDER; SAID SHELL HAVING WALLS TAPERING INWARDLY FROM THE TOP OF SAID CYLINDRICAL SURFACE TO THE TOP PORTION OF SAID INSULATOR AND CONFORMING IN SHAPE SUBSTANTIALLY TO THE OUTWARDLY FLARING PORTION OF SAID INSULATOR; A RING GASKET DISPOSED BETWEEN THE SAID OUTWARDLY TAPERING PORTION OF SAID INSULATOR AND THE INWARDLY TAPERING PORTION OF SAID SHELL AND HAVING A DIAMETER SUBSTANTIALLY THE SAME AS THAT OF THE CYLINDRICAL PORTION OF SAID INSULATOR; SAID SHELL HAVING A CUP-SHAPED BOTTOM HAVING INWARDLY PROJECTING SHOULDERS; AN ANNULAR INSULATOR RESTING ON SAID SHOULDER AND HAVING MEANS FOR ENGAGING THE BOTTOM OF SAID METAL CYLINDER; SAID HAVING TOP AND BOTTOM PORTIONS UNITED BY A CRIMP SEAM CRIMPED TO PLACE SAID GASKET UNDER COMPRESSION; INLET AND OUTLET MEANS FOR INTRODUCING AND WITHDRAWING A FLUID INTO AND FROM SAID SHELL AND PASSAGEWAYS THEREBETWEEN FOR DIRECTING FLUID TO FLOW BETWEEN SAID CONCENTRIC SURFACES IN ITS PASSAGE FROM SAID INLET MEANS TO SAID OUTLET MEANS; AND AN ELECTRICAL CONDUCTOR PASSING UPWARDLY FROM SAID METAL CYLINDER ALONG THE AXIS OF FIRST-NAMED INSULATOR TO THE TOP THEREOF.