Space-quakes in a Teacup

When tapped at any of the four cardinal points (North, South, East or West), a teacup with its handle towards the North emits the same ringing sound; when the tap is displaced by 45°, the note is about a semitone higher. The tapping distorts the circular rim, which is rapidly stretched and squeezed in perpendicular … Continue reading Space-quakes in a Teacup →