Use the No. 6 tube and the No. 2 plunger from Experiment 48, arrange as in Fig. 71, blow across the top, and move the plunger up and down. Do you get a most diabolical sound?
The sound is produced by the vibration of the air column between the top of the tube and the top of the plunger. Do you find that the pitch of the note is higher the shorter the air column?
Start with the air column long and blow the note, shorten it a little and blow the next note, continue, and try to blow the eight notes of an octave.
Fig. 71. The Diablo Whistle
Try to play a tune.
Try to make the most weird sound you can.