Abstract
Although the invention of the flextensional acoustic transducer is usually attributed to William J. Toulis, it was actually invented at the U. S. Naval Research Laboratories, Washington DC, in 1929 by Harvey C. Hayes. It was intended as a foghorn for the Lighthouse Service. This paper will review Hayes' flextensional from invention to disappearance (c. 1936), and discuss its reinvention and development by Toulis and Frank R. Abbott in the 1950s.
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