Proportioning condition control system

Claim 1

IN A SYSTEM FOR CONTROLLING A VARIABLE CONDITION, THE COMBINATION OF, A SENSING UNIT PROVIDING A SIGNAL VARIABLE WITH CHANGES OF SAID CONDITION, A PLURALITY OF CONTROLLER UNITS EACH HAVING AN AMPLIFYING DEVICE PROVIDING AN OUTPUT SIGNAL VARIABLE WITH CHANGES IN A SIGNAL APPLIED TO AN INPUT CIRCUIT EXTENDING BETWEEN FIRST AND SECOND ELECTRODES OF THE DEVICE, A SEQUENCING UNIT HAVING AN INPUT TERMINAL CONNECTED THROUGH SAID SENSING UNIT TO THE FIRST ELECTRODE OF EACH OF SAID AMPLIFYING DEVICES AND A PLURALITY OF OUTPUT TERMINALS EACH CONNECTED INDIVIDUALLY TO A DIFFERENT ONE OF SAID SECOND ELECTRODES, SAID SEQUENCING AND SENSING UNITS APPLYING TO SAID INPUT CIRCUITS THROUGH SAID DIFFERENT OUTPUT TERMINALS DIFFERENT SIGNALS VARIABLE WITH SAID SENSING UNIT SIGNAL, AND AT LEAST ONE FEEDBACK MEANS EACH CONNECTED TO AND COOPERATING WITH A DIFFERENT ONE OF SAID CONTROLLER UNITS, EACH OF SAID FEEDBACK MEANS PROVIDING A FEEDBACK SIGNAL PROPORTIONAL TO THE OUTPUT SIGNAL OF THE ASSOCIATED CONTROLLER UNIT AND INCLUDING AN ELEMENT CONNECTED TO THE PORTION OF SAID INPUT CIRCUIT OF THE UNIT EXTENDING BETWEEN SAID SECOND ELECTRODE OF THE UNIT AND THE ASSOCIATED OUTPUT TERMINAL OF SAID SEQUENCING UNIT AND BETWEEN SAID SENSING UNIT AND SAID FIRST ELECTRODE OF THE CONTROLLER UNIT WHEREBY THE FEEDBACK SIGNAL IS APPLIED TO THE CIRCUIT IN OPPOSITION TO THE SIGNAL FROM THE SEQUENCING AND SENSING UNITS WITHOUT VARYING THE ADJUSTMENT OF THE SEQUENCING UNIT.