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Published online by Cambridge University Press: 04 July 2016
Many of the flow patterns associated with experiments in fluid mechanics include vortices, or vortex sheets, and frequently knowledge as to the position and strength of these vortices is desirable. Wool tufts and spinners are useful in determining vortex position, but can give no indication of the vortex strength or circulation. Yawmeters cannot readily give vortex position, although (with a fair amount of labour) the circulation can be determined.