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Title: Sonic Nozzles Foe Gas Meter Calibration
Author: Harry R. Schroyer
Source: 1974 Gulf Coast Measurement Short Course (Now called ASGMT)
Year Published: 1974
Abstract: The terms sonic nozzle, critical flow nozzle, and critical flow venturi are synonymous. These are nozzles in which a well-rounded approach section blends with a small angle diverging cone. Smith and Matz in 1962 described a form of sonic nozzle. The emphasis was on a shape that permitted the nozzle calibration to be calculated from theoretical considerations. This form of construction, with minor alterations, has been widely used and has been proposed as an international standard.

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