Pyrophone

This sound may be caused to cease either, first, by increasing or reducing the height of the flame, and consequently increasing or diminishing its enveloping surface, so as to make the number of detonations no longer correspond with the number of vibrations necessary to produce a musical sound in the tube, or, secondly, by placing the flame at such a height in the tube as to prevent the vibration of the enveloping film.The pyrophone is similar to the steam calliope, but the difference is that in the calliope the combustion is external to the resonant cavity, whereas the pyrophone is an internal combustion instrument.

Operating under the constant pressures of an external combustion chamber, the calliope merely directs exhaust (HB# 421.22: internal fipple flutes).

By controlling the combustion specific to each resonant chamber, the pyrophone has, for better or worse, a greater range of variables in play when producing tones.

[1] Brewer, Moigno, and de Parville describe Kastner as having invented the instrument about twenty years before 1890,[5] and he filed a patent on Christmas Eve of 1874.

[3] Henry Dunant was a proponent, and Wendelin Weißheimer composed Five Sacred Sonnets for Voice, Flute, Oboe, Clarinet, Pyrophone and Piano (1880).