SENSITIVE NAKED FLAMES
by John Tyndall, D.C.L., LL.D., F.R.S.

We have hitherto dealt with flames surrounded by resonant tubes; and none of these flames, if naked, would respond in any way to such noise or music as could be here applied. Still it is possible to make naked flames thus sympathetic. It is also possible to silence the singing flame by proper management of the voice.