Water organ
（重定向自Hydraulis）
![The water organ (or hydraulis). Note the presence of the curved trumpet, called the bukanē by the Greeks and, later, cornu by the Romans.](/Images/godic/202501/19/Hydraulis_0015723.jpg")
![Hydraulis, 1st century BC, Archaeological Museum of Dion, Greece](/Images/godic/202501/19/Dion654a_ancient_organ5724.jpg")
![A modern reconstruction of the wind organ and wind wheel of Heron of Alexandria](/Images/godic/202501/19/Heron's_Windwheel5724.png")
![Reconstruction of hydraulic organ](/Images/godic/202501/19/Hydraulis5724.jpg")
The water organ or hydraulic organ (Greek:ὕδραυλις) (early types are sometimes called hydraulis, hydraulos, hydraulus or hydraula) is a type of pipe organ blown by air, where the power source pushing the air is derived by water from a natural source (e.g. by a waterfall) or by a manual pump. Consequently, the water organ lacks a bellows, blower, or compressor.