In January 1885, the Glaswegian Professor of Chemistry Dr Robert Carter Moffat organised a special operatic concert at St James’s Hall, London, to which he invited around two thousand scientists and musicians. The point of this invitation concert was that all the singers used bottled air. Moffat himself appeared between the various performances, wielding his mysterious Ammoniaphone, or bottled-air machine, a long silver tube which he flourished in the faces of his audience while describing its virtues with considerable animation. The premise of the Ammoniaphone was that since Italian opera