The Glass Armonica.   Franklin always said that of all of his many inventions, this musical instrument, which could produce the pure dulcet tones of an angelic choir, was his very favorite. He got the idea while in London, as a representative of the Pennsylvania Legislature to Parliament in the late 1750s. He attended a concert at which music was played on a set of water-tuned wine glasses. He was captivated by the sound, but having an inventive turn of mind, he sought a more efficient and convenient method by which to produce it

Franklin introduced his invention in England in 1762, less than two years after George III had become king. Though he had originally dubbed it the "glassychord," he later changed the name of this instrument to the "glass armonica." In England it was also known as the "glass harp" or "musical glasses." Like Franklin himself, this instrument was very well received and it is estimated that more than four hundred musical works were composed for it. Over the course of the next seventy years at least five thousand instruments were constructed and played throughout Europe and America. Yet, by the death of George IV, it had almost completely disappeared from the musical scene.

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