Chemical blank colorimetric analyzer

Claim 1

IN A COLORIMETRIC ANALYZER FOR ETERMINING AN AMOUNT OF A CONSTITUENT IN A FLUID BY SIMULTANEOU OPTICAL COMPARISON OF RADIATION TRANSMISSION PROPERTIES OF EQUAL VOLUME SAMPLES OF THE FLUID, SAMPLE AND COMPARISON CELLS, MEANS FOR INTRODUCING SEPARATE VOLUMETRIC INCREMENTS OF SAMPLE FLUID INTO EACH SAID CELL, MEAND FOR INTRODUCING FIRST AND SECOND INCREMENTS OF A PLURALITY OF REAGENTS OF EQUAL VOLUME AND STRENGTH INTO SAID SAMPLE AND COMPARISON CELLS RESPECTIVELY, SAID FIRST INCREMENT OF REAGENTS OPERABLE TO EFFECT BY CHEMICAL REACTION A COLOR CHANGE IN THE FLUID IN SAID SAMPLE CELL BY AN AMOUNT RELATED TO THE AMOUNT OF CONSTITUENT IN SAID SAMPLE FLUID AND REAGENTS, MEANS IN FLUID COMMUNICATION WITH SAID COMPARISON CELL FOR PREMIXING AT LEAST TWO REAGENTS OF SAID SECOND INCREMENT TO EFFECT BY CHEMICAL REACTION A COLOR CHANGE BY AN AMOUNT RELATED SOLELY TO THE AMOUNT OF CONSTITUENT IN SAID REAGANTS PRIOR TO MIXING THEREOF WITH THE FLUID IN SAID COMPARISON CELL AND THE REMAINDER OF REAGANTS IN SAID SECOND INCREMENT OPERABLE TO PREVENT REACTIVITY OF SAID PREMIXED REAGENT WITH THE CONSTITUENT IN THE SAMPLE FLUID IN SAID COMPARISON CELL AND MEANS FOR MEASURING AND COMPARING THE RADIATION TRANSMISSION RATIO OF THE FLUID IN SAID SAMPLE AND COMPARISON CELLS TO INDICATE PRECISELY THE CONCENTRATION OF SAID CONSTITUENT IN SAID SAMPLE FLUID.