Annunciator system

Claim 1

ANNUNCIATOR APPARATUS FOR MONITORING THE CONDITION OF A NUMBER OF VARIABLES COMPRISING FIRST AND SECOND VISUAL ALARM MEANS FOR EACH VARIABLE EACH OPERATIVE FROM A NORMAL INDICATION TO AN ALARM INDICATION, AUDIBLE ALARM MEANS, CONDITION RESPONSIVE MEANS FOR EACH VARIABLE RESPONSIVE TO THE CONDITION OF SAID VARIABLE TO BE MONITORED AND HAVING A NORMAL INDICATING CONDITION WHEN THE VARIABLE TO BE MONITORED IS NORMAL AND AN ABNORMAL INDICATING CONDITION WHEN THE VARIABLE IS ABNORMAL, A FIRST STATIC ELEMENT BISTABLE CONTROL CIRCUIT FOR EACH VARIABLE EXCLUSIVELY FOR THE ASSOCIATED FIRST VISUAL ALARM MEANS OPERATED DIRECTLY BY SAID CONDITION RESPONSIVE MEANS AND CONNECTED BETWEEN SAID CONDITION RESPONSIVE MEANS AND SAID FIRST VISUAL ALARM MEANS, SAID CONTROL CIRCUIT OPERATING THE ASSOCIATED FIRST VISUAL ALARM MEANS TO SAID NORMAL AND ALARM INDICATIONS WHEN SAID CONDITION RESPONSIVE MEANS IS RESPECTIVELY IN SAID NORMAL AND ABNORMAL INDICATING CONDITIONS, A SECOND STATIC ELEMENT BISTABLE CONTROL CIRCUIT FOR EACH VARIABLE FOR THE ASSOCIATED SECOND VISUAL ALARM MEANS INDEPENDENT OF SAID FIRST CONTROL CIRCUIT AND CONNECTED BETWEEN SAID CONDITION RESPONSIVE MEANS AND SAID SECOND VISUAL ALARM MEANS, SAID SECOND CONTROL CIRCUIT EFFECTING THE OPERATION OF THE ASSOCIATED SECOND VISUAL ALARM MEANS TO ITS ALARM INDICATION WHEN THE CONDITION OF SAID CONDITION RESPONSIVE MEANS CHANGES FROM SAID NORMAL INDICATING CONDITION TO SAID ABNORMAL INDICATING CONDITION, A THIRD STATIC ELEMENT BISTABLE CONTROL CIRCUIT IN COMMON WITH SAID VARIABLE AND FOR SAID AUDIBLE ALARM MEANS INDEPENDENT OF SAID FIRST AND SECOND CONTROL CIRCUIT AND CONNECTED BETEWEEN SAID CONDITION RESPONSIVE MEANS AND SAID AUDIBLE ALARM MEANS, SAID THIRD CONTROL CIRCUIT EFFECTING THE OPERATION OF SAID AUDIBLE ALARM MEANS WHEN THE CONDITION RESPONSIVE MEANS CHANGES FROM SAID NORMAL INDICATING CONDITION TO SAID ABNORMAL INDICATING CONDITION, THE MUTUAL INDEPENDENCE OF SAID FIRST, SECOND AND THIRD CONTROL CIRCUITS PROVIDING OPERATION OF SAID MEANS CONTROLLED BY TWO OF SAID CONTROL CIRCUITS DESPITE THE DEFECTIVE OPERATION OF ONE OF THE CONTROL CIRCUITS, AND MANUALLY OPERABLE ACKNOWLEDGEMENT MEANS FOR RESETTING SAID SECOND AND THIRD CONTROL CIRCUITS TO CANCEL SAID ALARM INDICATION ON SAID SECOND VISUAL ALARM MEANS AND TO SILENCE SAID AUDIBLE ALARM MEANS.