“…This arrangement was employed in the pioneer work of Yeh & Cummins (1964) and has subsequently been used by many authors. Goldstein & Hagen (1967), Welch & Tomme (1967) and Pike, Jackson, Bourke & Page (1968) applied it to turbulent water flow and Huffaker, Fuller & Lawrence (1969) and Lewis, Foreman, Watson & Thornton (1968) to turbulent air flow. More recently, it has been applied to a wider range of flow configurations, and among these may be cited the laminar, oscillatory water flow measurements of Denison & Stevenson (1970), the blood-flow investigations of Goldstein & Kreid (1971), the passage of a shock wave through water studied by Anderson, Edlund & Vanzant (1971) and the supersonic-flow investigations of Jackson & Paul (1971).…”