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This theory is dependent upon the assumption of two discrete streams - the motive stream and the evaporated vapour - maintaining their identity down the converging duct of the diffuser. It is postulated that the secondary vapours reach sonic velocity and are therefore effectively chocked at some cross-section of the ejector. Standard calculations of nozzle flow enable the capacity of the ejector to be found, and in turn a prediction of steam jet refrigerator performance. Agreement between the new theory and plant-scale tests has been found, and this new theory is supported by the literature. It is concluded that steam jet refrigerating units should be designed for the most-often prevailing conditions. (Author)