Somewhere round or about the late 1850s, John Tyndall FRS [* see note below] was developing and perfecting his experiments with “Sensitive Flames”. He describes one such experiment in his book ‘Sounds’ (p. 238). In which he reads a passage of poetry from Edmund Spenser’s ‘Belphœbe the Huntress’ to the flame (which he calls The Vowel-flame) […]