Note 92 — Chapter XIV · THE ORGAN FROM THE EARLIEST TIMES TO THE PRESENT

An interesting example of the primitive application of the hydraulic principle in producing musical sound is afforded by the ‘whistling jug’ of the Peruvian Incas. Here water flowing from one jar to another, through the medium of a cross-channel, forced the air through a whistle set over the mouth of the second jar, with a resulting musical note. The inverse tipping of the jar drew in the air again through the whistle.