The flicker of luminous flames

The vibratory motion of luminous flames has been studied by the photographic method. The rate of vibration, speed of flame, movement, and amplitude of vibration have been determined for various gases under different conditions. The data show that the upper portion of the luminous zone rises to a maximum height ten times per second. This rate of vibration is not greatly affected by change in conditions. The lower portion of the flame has a continuous existence, but periodically gives off another flame, which rises above the main flame during its short period of existence.