What is "pyrophone"

Pyrophone \Pyr"o*phone\, n. [Pyro- + Gr. ? sound.] A musical instrument in which the tones are produced by flames of hydrogen, or illuminating gas, burning in tubes of different sizes and lengths.

n. (context music English) a musical instrument in which the sound is produced by flames of gas in tubes of different length

A pyrophone, also known as a "fire/explosion organ" or "fire/explosion calliope" is a musical instrument in which notes are sounded by explosions, or similar forms of rapid combustion, rapid heating, or the like. It was invented by Georges Frédéric Eugène Kastner.