Fault alarm display systems

Claim 1

IN DISPLAY APPARATUS FOR PROVIDING TO AN OPERATOR INDICATIONS OF FAULTS OCCURRING IN AN EQUIPMENT THE COMBINATION OF, A PLURALITY OF ALARM GATES OPENED TO THE PASSAGE OF SIGNALS IN RESPONSE TO AN APPLIED POTENTIAL, A SOURCE OF A PREDETERMINED INITIATING POTENTIAL, AN INDIVIDUAL ALARM SWITCH ACTUATED IN RESPONSE TO THE OCCURRENCE OF EACH SAID FAULT CONDITION, EACH SAID SWITCH BEING ARRANGED WHEN ACTUATED TO APPLY SAID PREDETERMINED INITIATING POTENTIAL TO AN ASSOCIATED ONE OF SAID ALARM GATES, INTERROGATOR MEANS RESPONSIVE TO THE ACTUATION OF ANY SAID ALARM SWITCH BY APPLYING TO EACH IN TURN OF SAID ALARM GATES FOR A FIRST, SHORTER PERIOD OF TIME A GATE-OPENING POTENTIAL AND TO RESPOND TO THE APPEARANCE OF SAID POTENTIAL AT THE OUTPUT OF SAID GATE BY MAINTAINING SAID GATE-OPENING POTENTIAL APPLIED TO SAID GATE FOR A SECOND, LONGER PREDETERMINED PERIOD OF TIME, INDIVIDUAL MEANS RESPONSIVE TO THE APPEARANCE OF SAID INITIATING POTENTIAL AT THE OUTPUT OF EACH SAID ALARM GATE FOR PRODUCING SETS OF CONTROL SIGNALS IN APPROPRIATE SEQUENCE, A CATHODE RAY TUBE DISPOSED IN THE FIELD TO VIEW OF SAID OPERATOR, CONTROL CIRCUITS FOR CONTROLLING THE PRODUCTION AND DEFLECTION OF THE BEAM OF SAID CATHODE RAY TUBE IN ACCORDANCE WITH RECEIVED SIGNALS, AND MEANS FOR APPLYING SAID SETS OF CONTROL SIGNALS TO SAID CONTROL CIRCUITS, SO AS TO DEVELOP ON THE SCREEN OF SAID CATHODE RAY TUBE A DISPLAY INDICATIVE OF THE OCCURRENCE OF THE INITIATING FAULT CONDITION.