Abstract
A description is given of the construction and performance characteristics of an instrument which is capable of measuring flow speeds in water a point over a range of 1 to 14 ft/s. The accuracy at 1 ft/s is approximately 1½% and improves rapidly with increasing speed. The Leon tube is of robust and compact construction and is, in effect, a combination of a differential pressure tube and a differential liquid manometer. The pressure factor of the tube, which is a function of Reynolds number, is most readily determined in a wind tunnel. The instrument has proved to be particularly suitable for the performance of velocity traverses in open channels.
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