The Hydraulis is the first keyboard instrument.
The Hydraulis is the first keyboard instrument.
hydraulis
hydraulis
hydraulis (apex program)
hydraulis
The first pipe organ, called the hydraulis, was invented in Greece.
hydraulis
hydraulic pump
The hydraulis. It was thought to have been invented by Ctesibius around 465 B.C.
hydraulis
An early version of the pipe organ, called a hydraulis, was invented in Greece in the 3rd century BC.