Download or read book 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 ... written by Benjamin Franklin and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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."