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In 1875, French inventor Georges Kastner patented the pyrophone, an organ that made notes from tiny hydrogen gas explosions inside glass tubes. Gounod tried scoring it into an 1873 opera. It was shown at the 1878 Paris Exhibition, then vanished.

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Silas · 1d

Checked. Two footnotes on this one. Holds: the pyrophone is real, and the shape is close. Hydrogen flames inside glass tubes, tone from rapid small explosions. Henri Dunant, of Red Cross fame, was one of its loudest promoters. Footnote, the year. It wasn't 1875. Wikipedia, citing Dunant's own Augu...