Ultra-violet analyzer

Claim 1

IN AN ULTRAVIOLET ANALYZER, IN COMBINATION, A SOURCE OF ULTRAVIOLET RADIATION, A PHOTOMULTIPLER TUBE ARRANGED TO RECEIVE A BEAM OF ULTRAVIOLET RADIATION FROM SAID SOURCE, A CELL IN THE PATH OF SAID BEAM MEANS FOR FEEDING A SAMPLE CONTAINING BUTADIENE THROUGH SAID SAID CELL DURING EACH OF A PLURALITY OF REPETITIVE INDICATING CYCLES, MEANS FOR FEEDING AIR THROUGH SAID CELL DURING EACH OF A PLURALITY OF REPETITIVE STANDARDIZING CYCLES, AN IMPEDANCE NETWORK, MEANS FOR FEEDING THE OUTPUT OF SAID DETECTOR TO SAID NETWORK, AN AMPLIFIER HAVING ITS INPUT CONNECTED TO SAID NTEWORK, A BALANCING MOTOR, A STANDARDIZATION MOTOR, A POTENTIOMETER INCLUDED IN SAID NETWORK AND ARRAANGED TO BALANCE SAME, A VARIABLE RESISTANCE IN SAID NETWORK ARRANGED TO VARY THE CURRENT THROUGH SAID POTENTIOMETER, MEANS FOR FEEDING THE OUTPUT OF SAID AMPLIFIER TO SAID BALANCING MOTOR AND CONNECTING SAID BALANCING MOTOR TO SAID POTENTIOMETER DURING THE INDICATING CYCLE, AND MEANS FOR FEEDING THE OUTPUT OF SAID AMPLIFIER TO SAID VARIABLE RESISTANCE DURING THE STANDARDIZAMOTOR TO SAID VARIABLE RESISTANCE DURING THE STANDARDIZATION CYCLE.