Mystery Object of the week #11 Answer

Congratulations to Martyn Dowel, Rolf Christian Holth Olsen and Robert Spencer who all correctly identified this weeks mystery object  – The Auxetophone designed by the British engineer Sir Charles Parsons.    The Auxetophone was perhaps the most effective attempt, prior to the development of electrical amplification in the 1920’s, of increasing volume. Invented in 1904, it used air pressureContinue reading “Mystery Object of the week #11 Answer”

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