Temperature regulating apparatus

Claim 1

A TEMPERATURE REGULATING APPARATUS COMPRISING A BRIDGE CIRCUIT INCLUDING FOUR INTERCONNECTED BRIDGE BRANCHES, EACH OF WHICH INCLUDES AN IMPEDANCE ELEMENT, ONE OF SAID IMPEDANCE ELEMENTS CONSISTING OF A FIRST TEMPERATURE RESPONSIVE RESISTANCE, AND TWO DIAGONAL BRANCHES EACH CONNECTED BETWEEN TWO OF SAID BRIDGE BRANCHES, THE FIRST OF SAID DIAGONAL BRANCHES INCLUDING A PAIR OF CONNECTED IMPEDANCE ELEMENTS HAVING A COMMON JUNCTION, ONE OF SAID CONNECTED IMPEDANCE ELEMENTS CONSISTING OF A SECOND TEMPERATURE RESPONSIVE RESISTANCE HAVING ONE TERMINAL CONNECTED TO ONE TERMINAL OF SAID FIRST TEMPERATURE RESPONSIVE RESISTANCE, AND THE SECOND OF SAID DIAGONAL BRANCHES INCLUDING AT LEAST ONE IMPEDANCE ELEMENT HAVING ONE TERMINAL CONNECTED TO THE JUNCTION OF SAID PAIR OF CONNECTED IMPEDANCE ELEMENTS AND A SECOND TERMINAL CONNECTED TO AN ELEMENT HAVING A DIRECTION SENSITIVE IMPEANCE TO THE TERMINAL OF SAID FIRST TEMPERATURE RESPONSIVE RESISTANCE REMOTE FROM THE COMMON TERMINAL BETWEEN SAID FIRST AND SECOND TEMPERATURE RESPONSIVE RESISTANCES, SAID DIRECTION SENSITIVE IMPEDANCE ELEMENT CUTTING OFF OR CONDUCTING THE CURRENT FLOW THROUGH SAID SECOND DIAGONAL BRANCH IMPEDANCE ELEMENT ACCORDING TO A PREDETERMINED ADJUSTABLE RESISTANCE RATIO OF SAID FIRST AND SECOND TEMPERATURE RESPONSIVE RESISTANCES, WHEREBY THE BRIDGE OUTPUT REGULATION VOLTAGE ACROSS SAID SECOND DIAGONAL BRANCH IS AFFECTED BY ONE OF SAID TEMPARATURE RESPONSIVE RESISTANCES DEPENDING UPON WHETHER SAID DIRECTIONAL SENSITIVE IMPEDANCE ELEMENT IS CONDUCTING OR NON-CONDUCTING.