Programmer for chromatography

Claim 1

THE COMBINATION COMPRISING A CHROMATOGRAPHIC COLUMN; A SAMPLE CELL CONNECTED TO SAID COLUMN; A WHEATSTONE BRIDGE HAVING ONE BRANCH DISPOSED IN SAID SAMPLE CELL; A PAIR OF OUTPUT TERMINALS ON SAID BRIDGE; MEANS FOR INDICATING AND RECORDING IN BAR GRAPH FORM SELECTED SIGNALS APPEARING AT SAID OUTPUT TERMINALS; MEANS FOR CONNECTING SAID OUTPUT TERMINALS TO SAID MEANS FOR INDICATING INCLUDING A PLURALITY OF PARALLEL-CONNECTED ATTENUATORS, EACH SAID ATTENUATOR HAVING AN INDIVIDUAL SWITCH IN SERIES THEREWITH; AND A PROGRAMMER FOR ACTUATING SAID INDIVIDUAL SWITCHES IN A PREDETERMINED SEQUENCE COMPRISING A SWITCHACTUATING MEMBER FOR EACH SAID SWITCH; A PAIR OF ACTUATING DEVICES FOR EACH SAID MEMBER, ONE DEVICE OF EACH OF SAID PAIRS ACTUATING SAID MEMBER OF A CORRESPONDING SWITCH TO CAUSE SAID SWITCH TO CLOSE, A SECOND DEVICE OF EACH OF SAID PAIRS ACTUATING SAID MEMBER TO CAUSE SAID CORRESPONDING SWITCH TO OPEN INDEPENDENTLY OF SAID FIRST DEVICE, ACTUATING DEVICE ADJUSTING MEANS FOR ADJUSTING THE ANGULAR POSITION OF EACH OF SAID DEVICES INDEPENDENTLY TO VARY THE ANGULAR RELATIONSHIP BETWEEN SAID DEVICES AND BETWEEN SAID DEVICES AND DRIVING MEANS THEREFOR; A CHART MOTOR CONNECTED TO SAID MEANS FOR INDICATING AND RECORDING; AND A DELAY RELAY MEANS ACTUATED IN RESPONSE TO SAID ONE DEVICE OF EACH OF SAID PAIRS TO DEENERGIZE SAID CHART MOTOR AND TO ENERGIZE SAID CHART MOTOR FOR A PREDETERMINED PERIOD OF TIME WHEN EACH OF SAID SWITCHES IS OPENED.