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Hodgson (1917) commenced research on orifice flow measurement in 1909 and published his work in 1917; he records that the first orifice used for steam-flow measurement that was furnished to him came from Holbrook Gaskell of the United Alkali Company in 1910. 10 History 19 Fig. , for the 17′ 0″ Venturi meters, Catskill Aqueduct, New York water supply [photograph and caption from Kent (1912)] Fig. 11 Installation of a mammoth “Venturi” meter for measuring 14,000,000 gallons per hour. Inserting the meter tube [photograph and caption from Kent (1912)] 20 1 Introduction and History which was thought to be at the vena contracta.

International Organization for Standardization, Geneva. ISO 5167:1980 ISO (1991) Measurement of fluid flow by means of pressure differential devices—part 1: orifice plates, nozzles and Venturi tubes inserted in circular cross-section conduits running full. International Organization for Standardization, Geneva. ISO 5167-1:1991 ISO (1998) Measurement of fluid flow in closed conduits—guidelines on the effects of flow pulsations on flow measurement instruments. International Organization for Standardization, Geneva.

He became Professor of Mathematics in St Petersburg in his twenties. He successively held the chairs of medicine, metaphysics and natural philosophy at the University of Basel. He won ten prizes from the Paris Académie des Sciences: among them were ones for clepsydra for use at sea, tides (with Euler and Maclaurin), orbits (with his father), the best form of anchors (with his brother), and the nature & cause of ocean currents. He was the first person to derive Bernoulli’s Theorem (Bernoulli 1738).

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