Ratio

Claim 1

FLUID BLENDING APPARATUS COMPRISING A MIXING CHAMBER, FIRST CONDUIT MEANS COMMUNICATING WITH SAID CHAMBER TO INTRODUCE A FIRST FLUID, SECOND CONDUIT MEANS COMMUNICATING WITH SAID CHAMBER TO INTRODUCE A SECOND FLUID, THIRD CONDUIT MEANS COMMUNICATING WITH SAID CHAMBER TO REMOVE BLENDED FLUID THEREFROM, FIRST FLOW CONTROL MEANS ASSOCIATED WITH SAID FIRST CONDUIT MEANS TO MAINTAIN FLOW THERETHROUGH AT A PREDETERMINED RATE, RATIO CONTROLLER MEANS RESPONSIVE TO SAID FIRST FLOW CONTROL MEANS TO MAINTAIN THE FLOW THROUGH SAID SECOND CONDUIT MEANS AT A PREDETERMINED RATIO WITH RESPECT TO THE FLOW RATE THROUGH SAID FIRST CONDUIT MEANS, A REFRACTOMETER CELL COMPRISING TWO ADJACNT CHAMBERS SEPARATED BY A PLATE OF RADIATION TRANSPARENT MATERIAL, ONE OF SAID CHAMBERS BEING ADAPTED TO CONTAIN A REFERENCE FLUID, MEANS TO CIRCULATE FLUID FROM SAID THIRD CONDUIT MEANS THROUGH THE OTHER OF SAID CHAMBERS, MEANS TO DIRECT A BEAM OF RADIATION THROUGH SAID CHAMBERS, MEANS TO MEASURE THE DEVIATION OF SAID BEAM, AND MEANS RESPONSIVE TO SAID MEANS TO MEASURE TO RESET SAID RATIO CONTROLLER MEANS TO CHANGE SAID PREDETERMINED RATIO SO AS TO MAINTAIN THE REFRACTIVE INDEX OF FLUID IN SAID THIRD CONDUIT MEANS AT A PREDTERMINED VALUE.