Abstract
The history and previous scientific work concerning vibrations maintained by fluid motion is first described. New experiments for testing, by several methods, the dependence of the pitch n on the fluid speed V, and on the diameter D, of the vibrator in a number of fluids follow. The results show V/nD to fall from 8 to 5, while D ranges from 0.02 to 2 cm., whatever the viscosity. Results for square-section cords are also given, and a value of the critical speed for turbulence deduced.
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