The Pitot-Venturi flow element is a velocity-measuring device having found wide use as an air-speed indicator, particularly during World War I. A considerable number of design changes have been made since, and this paper treats a specific form of the element and discusses the effect which the various components used in its assembly have on its calibration. Flow equations are developed and the method of determining the element’s coefficient and exponent is described. The paper concludes with suggested methods of installation and an analysis of its position in the flow-measurement field.

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