- #1
JT Smith
- 386
- 547
- TL;DR Summary
- tone produced by blowing into a cylindrical tube with small, regularly spaced holes at one end
While trying to dislodge some stubborn coffee debris in the holes of a wet espresso bottomless portafilter by blowing into it I discovered that it produced a tone at just over 3000Hz, with harmonics. I wondered, is there some way to use that to determine something about the hole size and spacing? Or is it more complicated than that?