“Vibrations of the Air”

If a person stand beneath a railway girder-bridge with an open umbrella over his head, when a train is passing, the vibration of the air will be distinctly felt in the hand which grasps the umbrella, because the outspread surface collects and concentrates the waves into the focus of the handle.

Barkham Burroughs’ Encyclopaedia of Astounding Facts and Useful Information, 1889