Hydraulis (from Gk. hudōr: ‘water’ and aulos: ‘pipe’ or aulē: ‘chamber’)
- James W. McKinnon
The ancient water organ (an Aerophone, an important musical instrument of later classical antiquity and the direct ancestor of the modern pipe organ. It is to be distinguished from the hydraulic or Water organ. In the latter the wind supply comes from air compressed by continuously flowing water. The hydraulis is bellows blown (by hand or by windmill), but water is used to stabilize the wind pressure....