Bridge circuit with two distinct indicating outputs

Claim 1

IN A BRIDGE CIRCUIT WHEREIN TWO OPPOSED BRIDGE CORNERS TO WHICH VOLTAGE IS TO BE APPLIED ARE CONNECTED BY TWO PARALLEL CIRCUIT PATHS, EACH DEFINED BY A PAIR OF SERIES CONNECTED LEGS DEFINING A COMMON OUTPUT BRIDGE CORNER THEREBETWEEN: A FIRST INDICATING DEVICE CONNECTED TO AND RESPONSIVE TO A VOLTAGE DIFFERENCE BETWEEN THE TWO COMMON OUTPUT BRIDGE CORNERS OF THE TWO PAIRS OF LEGS; A VARIABLE RESISTANCE MEASURING DEVICE ELECTRICALLY CONNECTED IN A FIRST LEG OF A FIRST ONE OF THE TWO PAIRS OF LEGS, SAID MEASURING DEVICE PRESENTING WITHIN THE CIRCUIT A VALUE OF RESISTANCE WHICH VARIES AS A FUNCTION OF THE MAGNITUDE OF AN EXTERNAL CONDITION BEING MEASURED BY SAID MEASURING DEVICE; AN ELECTRO-MAGNETICALLY OPERATED RALAY HAVING AT LEAST A PORTION OF ITS INPUT COIL IN THE SECOND LEG OF THE FIRST PAIR OF LEGS SUCH THAT SAID RELAY OPERATES WHEN THE MAGNITUDE OF THE EXTERNAL CONDITION BEING MEASURED BY SAID MEASURING DEVICE PASSES THROUGH A PRESCRIBED VALUE; AND A SECOND INDICATING DEVICE OPERATIVELY RESPONSIVE TO THE OPEATION OF SAID RELAY TO INDICATE WHETHER THE MAGNITUDE OF THE EXTERNAL CONDITION IS ABOVE OR BELOW A PRESCRIBED VALUE.