Concept Overview
- Overtones
- Harmonics
Lecturer Procedure
Steps to Follow
- Connect the supply tube to the high pressure air outlet.
- Adjust the flow of air using the dial on the end nearest the tube.
Expected Result
Up to 20 pure overtones can be heard.
Historical References; Taken from original work of Percy H. Carr, 1970
“The pipe is designed to produce uniquely the various overtones the pipe is capable of emitting. Connect the supply tube to the high pressure air outlet, and place the lever for fine control on the cock controlling air flow. The spacing between the jet and lip at the mouth of the pipe is also capable of fine adjustment. By starting with as low a flow of air as will cause the pipe to sound and adjusting alternately the flow control and the jet-to-lip distance control you can obtain most of the first twenty overtones in a pure state. If the air flow is made too great, many overtones are excited at once and the pipe sounds like a boat whistle. The pipe can be operated with the end either open or closed, but the cleanest results seem to be obtained with the end closed.”