Alfred Mayer

Person

Professor who presented the 'topophone' in 1880, an early device using adjustable hearing cones to locate distant sounds like ship fog horns.

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These Illusions Fool Almost Everyone

These Illusions Fool Almost Everyone

Veritasium

Professor who presented the 'topophone' in 1880, an early device using adjustable hearing cones to locate distant sounds like ship fog horns.