Data control system

Claim 1

DATA MEASURING AND DISPLAY APPARATUS FOR AUTOMATICALLY AND SEQUENTIALLY MEASURING A PLURALITY OF PHYSICAL CONDITIONS AND DISPLAYING SAID MEASUREMENTS COMPRISING A PLURALITY OF TRANSDUCERS FOR INDIVIDUALLY MEASURING SELECTED PHYSICAL CONDITIONS AT DIFFERENT LOCATIONS, ELECTRICAL MEANS CONNECTED TO EACH TRANSDUCER AND RESPONSIVE TO CHANGES THEREIN WITH EACH ELECTRICAL MEANS PRODUCING A PREDETERMINED VOLTAGE CHANGE FOR EACH UNIT CHANGE OF THE CONDITION BEING MEASURED BY ITS ASSOCIATED TRANSDUCER AND ZERO VOLTAGE WHEN THE CONDITION IS NORMAL, A SELECTOR SWITCH HAVING AT LEAST TWO BANKS OF CONTACTS AND A COOPERATING CONTACTING ARM FOR EACH BANK, TIMING MEANS CONNECTED TO SAID SELECTOR SWITCH TO PERIODICALLY CYCLE SAID CONTACTING ARMS, A CONNECTION BETWEEN EACH OF SAID ELECTRICAL MEANS AND ONE OF THE CONTACTS OF ONE BANK, AN AMPLIFIER HAVING AN INPUT AND OUTPUT, A CONNECTION BETWEEN THE CONTACTING ARM OF SAID ONE BANK AND THE INPUT OF SAID AMPLIFIER, SCALE FACTOR ADJUSTING MEANS INCLUDING AT LEAST ONE ADJUSTABLE REFERENCE VOLTAGE SOURCE, MEANS COUPLING SAID REFERENCE VOLTAGE WITH THE SIGNAL AT THE OUTPUT OF SAID AMPLIFIER TO PRODUCE A COMPOSITE SIGNAL WHICH HAS A MAGNITUDE EQUAL TO THE REFERENCE SIGNAL WHEN THE OUTPUT SIGNAL FROM SAID AMPLIFIER IS ZERO AND PROVIDING A PREDETERMINED CHANGE IN MAGNITUDE FOR A GIVEN UNIT CHANGE OF THE CONDITIONS BEING MEASURED WHEN THE AMPLIFIER SIGNAL DEPARTS FROM ZERO, INDICATING MEANS, A CONNECTION BETWEEN SAID COUPLING MEANS AND SAID INDICATING MEANS, AND MEANS CONNECTED TO SAID OTHER BANK OF CONTACTS TO INDICATE THE PHYSICAL LOCATION OF EACH CONDITION AS IT IS DISPLAYED ON SAID INDICAATING MEANS.