In this paper the authors give particulars regarding a system of steam-flow measurement by means of a nozzle for performance tests of jet-condensing, non-condensing, or extraction turbines where condensate measurements are out of the question. The system as outlined is on a laboratory basis in order to insure the accuracy necessary when steam-turbine guarantees are involved. One of the two appendixes presents an account of tests on which the system is based; the other deals with formulas for steam flow.

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