Temperature control means

Claim 1

A HEATING APPARATUS COMPRISING MEANS DEFINING MAIN HEATING ZONE, A MAIN ELECTRIC RESISTANCE HEATING ELEMENT DISPOSE IN SAID MAIN HEATING ZONE, A HOUSING SPACED AND THERMALLY ISOLATED FROM SAID HEATING ZONE AND SUBSTANTIALLY UNAFFECTED BY THE TEMPERATURE THEREIN, A SECOND ELECTRICAL RESISTANCE HEATING MEMBER DISPOSED IN SAID HOUSING AND SPACED FROM THE WALLS THEREOF AND A THERMOSTATIC SWITCH CARRIED BY AND IN HEAT CONDUCTING RELATIONSHIP WITH SAID SECOND ELECTRICAL RESISTANCE HEATING ELEMENT AND BEING HEATED SUBSTANTIALLY SOLELY THEREBY, SAID MAIN HEATING ELEMENT AND SAID SECOND HEATING MEMBER BEING CONNECTED TO A SOURCE OF CURRENT THROUGH SAID THERMOSTATIC SWITCH TO BE SIMULTANEOUSLY ENERGIZED AND DEENERGIZED, SAID SECOND HEATING MEMBER INCLUDING AN INSULATING CORE ABOUT WHICH IS HELICALLY WOUND AN ELECTRICAL RESISTANCE ELEMENT AND A PAIR OF INSULATING SHEETS SANDWICHING SAID RESISTANCE ELEMENT CARRYING CORE AND A PAIR OF PARALLEL METAL PLATES CLAMPING SAID SANDWICH, SAID THERMOSTATIC SWITCH BEING AFFIXED TO ONE OF SAID METAL PLATES.