Alarm memory circuit

Claim 1

IN A SYSTEM FOR REPEATEDLY SCANNING A PLURALITY OF QUANTITIES EACH COMPRISING A MEASURED VARIABLE AND INDICATING THE EXISTING RELATION BETWEEN THE MAGNITUDE OF EACH SAID QUANTITY AND A CORRESPONDING SET VALUE AND THE CHANGE, IF ANY, BETWEEN AN EXISTING RELATION AND THE RELATION EXISTING DURING A PREVIOUS SCAN OF SAID QUANTITY, THE COMBINATION COMPRISING MEANS FOR SETTING EACH SAID SET VALUE TO CORRESPOND WITH A PREDETERMINED MAGNITUDE OF EACH SAID QUANTITY, MEANS FOR COMPARING SAID QUANTITY AND SAID SET VALUE FOR PRODUCING AN OUTPUT SIGNAL ON ONE OF TWO LINES AND A COMPLEMENTARY SIGNAL ON THE OTHER LINE DEPENDING UPON WHETHER OR NOT SAID QUANTITY IS GREATER THAN SAID SET VALUE, MEANS FOR PRODUCING A CHECK PULSE AFTER SAID COMPARISON IS COMPLETED, FIRST GATE MEANS RESPONSIVE TO SAID OUTPUT SIGNAL AND TO SAID CHECK PULSE FOR PRODUCING AN OUTPUT, ADDRESSABLE RELAY MEMORY MEANS CONNECTED TO SAID FIRST GATE MEANS FOR SETTING THE ADDRESSED PORTION OF SAID RELAY MEANS IN ACCORDANCE WITH SAID OUTPUT FROM SAID FIRST GATE MEANS, MEANS FOR SEQUEN TIALLY APPLYING TO PORTIONS OF SAID RELAY MEMORY MEAN AN ADDRESS VOLTAGE FOR INTIALLY READING THE INFORMATION STORED IN SAID ADDRESSED PORTIONS OF SAID REALY MEMORY MEANS DURING THE PRECEDING SCAN OF SAID MEMORY MEANS AND FOR STORING INSAID ADDRESSED PORTIONS OF SAID MEMORY MEANS SAID EXISTING RELATION UPON ENERGIZATION OF SAID FIRST GATE MEANS BY SAID CHECK PULSE, MEANS FOR PRODUCING IN REPSONSE TO COMPLETION OF SAID CHECK PULSE A SECOND PULSE, AND SECOND GATE MEANS RESPONSIVE TO (1) SAID INFORMATION READ FROM SAID MEMORY MEANS, (2) TO SAID OUTPUT SIGNAL ONSAID ONE OF SAID TWOLINES, AND (3) TO SAID SECOND PULSE FOLLOWING SAID CHECK PULSE FOR PRODUCING A SIGNAL INDICATIVE OF A CHANGE IN SAID RELATION IN EITHER DIRECTION AND THE CONTINUATION OF A PRECEDING RELATION.