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Yes, for an open organ pipe. For an ideal closed pipe the numbering would again be something else. I don't have other pipes. The OP...

(Shouldn't that be the second and fourth harmonics, instead of second and fourth overtones?) When sliding the stopper through the organ...

In support of your point, see below two spectra I recorded just now from a wooden organ pipe in two situations. In the closed pipe the...

The blue/red color change occurs in some globes halfway the streamer, so not always at the border between streamer and pad. A paper, by...

The orange of neon, and the blue of argon/xenon, are fluorescence colors. De-excitation occurs in a sequence of smaller energy steps...

I'm sorry I annoyed you with my question. However, your quote from Wikipedia does not really answer my question about the different...

I have a common plasma globe with blue streamers and orange pads at both ends. The orange light is emitted by neon and the blue light is...