Wanometric Flames

—A peculiar effect is produced on a flame by sound waves. Koenig’s apparatus for indicating small variations of air pre ure, by its effect on a flame, consists of a metal “capsule” or box, divided into two chambers by an elastic diaphragm. At one end is an orifice for the admi ion of sounds from the voice or an instrument, and at the other is an ordinary gas burner, gas for which is admitted to the chamber in front of the diaphragm. If the gas be lighted and its supply be agitated by the sound waves striking against the diaphragm the flame will undergo perceptible changes in strength and steadine . These may be seen to advantage by taking a four-sided box with mirrors on every side and turning it rapidly in front of the flame. The resulting ‘‘image’’ will differ according to the eiren atb timbre and other characteristics of the sound.