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Updated: May 9, 2025
The same kind of charcoal permeated by platinum, tin, zinc, or other unoxidisable metal is also very suitable; and it is a significant fact that the most resonant woods, such as pine, poplar, and willow, yield the charcoals best adapted for the microphone. Professor Hughes' experimental apparatus is of an amusingly simple description.
Be that as it may, it was undoubtedly the fact that he had discovered two hitherto unknown substances, the properties of which would render them of priceless value whenever he should see fit to make them known: the one being an unoxidisable metal of extraordinary strength and tenacity, yet of so little weight that it was the lightest known solid, to which he had given the name of aethereum; while the other was a new power, derivable from certain chemically prepared crystals which, treated in one way, yielded electricity in enormous volumes, while, powdered and treated with a certain acid, they evolved an expansive gas of stupendous potency, capable of being advantageously used in place of any of the known explosives, or of steam.
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