Letter To Monsieur Dubourg 8 December 1772 Answer To Some Queries Of Monsieur Dubourg Respecting The Armonica From Memoirs Of The Life And Writings Of Benjamin Franklin

Benjamin Franklin explains the arrangement of the glasses in the "armonica," and explains how to play the instrument. He concludes that "nothing but experience can instruct with respect to this manipulation ... a few hours' exercise will teach this."

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