In addition to acoustic science, in what area did Bell conduct experiments, setting a world water-speed record in 1919?

Answer

Aeronautics and the design of hydrofoils.

Bell dedicated time to aeronautics and hydrofoil design, achieving a world water-speed record in 1919 with his HD-4 craft.

In addition to acoustic science, in what area did Bell conduct experiments, setting a world water-speed record in 1919?
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