Singing water bowl [singing bowl]
Friction idiophone, associated chiefly with Tibet and used as an aid to meditation. It is a non-ferrous metal bowl partly filled with water and rubbed around the outside of the rim with a baton, often wrapped with leather. The rim may also be struck. Rubbing the bowl gradually creates a travelling wave in the water around the circumference, and this generates a standing wave at the centre. The resulting vibration yields an audible pitch; the principle is the same as for water-tuned musical glasses. A Chinese form (‘spouting bowl’) has two flat loop handles soldered to the rim; rubbing these handles with damp hands causes vibration that is transmitted to the bowl and the water, creating standing waves (Chladni patterns) at the vibrational nodes, and sounding a pitch. As the waves reinforce one another, water droplets leap from the surface.
See also Musical glasses .