Immersion type heater

Claim 1

AN IMMERSION TYPE HEATER COMPRISING, AN ELONGATED TUBULAR METALLIC CASING CLOSED AT ONE EXTREMITY AND OPENED AT THE OTHER EXTREMITY, A HIGH RESISTANCE COIL HEATER ELEMENT, AN ELONGATED REFRACTORY INSULATING MEMBER HAVING A PAIR OF SPACED PARALLEL PASSAGES EXTENDING LONGITUDINALLY THERETHROUGH WITH A NOTCHED EXTREMITY, SAID HEATER COIL ELEMENT BEING POSITIONED IN SAID SPACED PARALLEL PASSAGES IN SAID REFRACTORY INSULATING MEMBER AND BEING BENT AT ITS MIDPOINT TO POSITION THE HALVES OF SAID HEATER COIL ELEMENT IN SAID RESPECTIVE PASSAGES, SAID NOTCHED EXTREMITY OF SAID INSULATING MEMBER POSITIONING THE BEND OF SAID HEATER COIL ELEMENT AND SPACING THE BEND OF SAID HEATER COIL ELEMENT FROM THE EXTREMITY OF SAID INSULATING MEMBER, SAID INSULATING MEMBER WITH SAID HEATER COIL ELEMENT THEREIN BEING POSITIONED IN THE CLOSED EXTREMITY OF SAID CASING AND EXTENDING FROM SAID CLOSED EXTREMITY SUBSTANTIALLY ONE-QUARTER OF THE EXTENT OF SAID CASING, A PAIR OF SOLID FLEXIBLE CONDUCTORS EXTENDING INTO SAID PASSAGES AND CONNECTED TO THE ENDS OF SAID HEATER COIL ELEMENT, A SECOND REFRACTORY INSULATING MEMBER WITH A PAIR OF SPACED PARALLEL PASSAGES THEREIN WITH SAID CONDUCTORS EXTENDING THROUGH SAID PASSAGES, SAID SECOND REFRACTORY INSULATING MEMBER BEING POSITIONED TO ABUT THE END OF SAID FIRST NAMED REFRACTORY INSULATING MEMBER AND ENCLOSE SAID CONDUCTORS AND EXTEND WITHIN SAID CASING APPROXIMATELY A DISTANCE OF LESS THAN ONE-QUARTER OF THE EXTENT OF SAID CASING, A FLEXIBLE INSULATED COVERING HAVING A SUBSTANTIALLY LOWER COMBUSION TEMPERATURE THAN SAID REFRACTORY INSULATING MEMBER POSITIONED OVER THE CONDUCTORS AND EXTENDING FROM SAID SECOND REFRACTROY INSULATING MEMBER SHORT OF THE OPENING IN THE END OF SAID CASING, AN INSULATED ELECTRICAL CONDUIT TELESCOPICALLY FITTING INTO THE OPEN END OF SAID CASING AND INCLUDING LEAD IN CONDUCTORS CONNECTED TO THE ENDS OF SAID SOLID CONDUCTORS IN SAID CASING, INSULATION MEANS COVERING THE CONNECTIONS OF SAID SOLID CONDUCTORS WITH SAID LEAD IN CONDUCTORS, AND MEANS INCLUDED IN PART IN SAID CASING SECURING SAID INSULATED ELECTRICAL CONDUIT IN THE END OF SAID CASING TO CLOSE THE SAME.