Means for calibrating the sensitivity of response of a condition-responsive circuit component

Claim 1

APPARATUS FOR CALIBRATING A CONDITION-RESPONSIVE CIRCUIT COMPONENT WITH RESPECT TO ITS SENSITIVITY OF RESPONSE TO CHANGES IN A CONDITION, SAID CIRCUIT COMPONENT BEING MADE UP OF FOUR ELECTRICAL RESISTANCE ELEMENTS ARRANGED IN THE FORM OF A BALANCED BRIDGE, SAID APPARATUS COMPRISING A SOURCE OF OPERATING POTENTIAL CONNECTED ACROSS TWO OPPOSITELY-DISPOSED JUNCTION POINTS ON SAID BRIDGE, AN ADJUSTABLE RANGE-SETTING RESISTOR, A POTENTIOMETER, MEANS CONNECTING SAID RANGE-SETTING RESISTOR AND THE RESISTANCE PORTION OF SAID POTENTIOMETER IN SERIES WITH ONE ANOTHER, MEANS CONNECTING THE ASSEMBLY FORMED Y SAID RANGESETTING RESISTOR AND THE RESISTANCE PORTION OF SAID POTENTIOMETER ACROSS THE TWO SAID OPPOSITELY-DISPOSED JUNCTION POINTS ON SAID BRIDGE IN PARALLEL WITH SAID SOURCE OF POTIAL, AND A SENSITIVITY-CALIBRATING NETWORK COMPRISING A FURTHER SOURCE OF POTENTIAL, A MANUALLY-ADJUSTABLE CURRENTCONTROL RESISTOR, AND A FIXED IMPEDANCE, ALL OF THE MENTIONED MEMBERS OF SAID NETWORK BEING CONNECTED IN SERIES TO FORM A CLOSED LOOP, A FURTHER CONNECTION BETWEEN A POINT INTERMEDIATE SAID FURTHER SOURCE OF POTENTIAL AND SAID FIXED IMPEDANCE TO ONE OF THE SAID TWO OPPOSITELYDISPOSED JUNCTION POINTS ON SAID BRIDGE, A VOLTAGE-MEASURING DEVICE, AND A CONNECTION FROM THE MOVABLE CONTACT OF SAID POTENTIOMETER THROUGH SAID VOLTAGE-MEASURING DEVICE TO A POINT ON SAID SENSITIVITY-CALIBRATING NETWORK INTERMEDIATE SAID FIXED IMPEDANCE AND SAID MANUALLY-ADJUSTABLE CURRENT-CONTROL RESISTOR.