Any proof of that claim? I've seen it mentioned more than once but only pointing back to some very early (1798) reports. Another good article on it with a coup

Any proof of that claim? I've seen it mentioned more than once but only pointing back to some very early (1798) reports. Another good article on it with a couple of sample videos http://krui.fm/2015/12/30/whats-sound-glass-armonica/ http://krui.fm/2015/12/30/whats-sound-glass-armonica/ http://www.glassarmonica.com/census.php http://www.glassarmonica.com/census.php This research paper mentioned several claims about it through Franklin himself suffered no damage despite playing it for years http://www.sciencedirect.com/science/article/pii/S0079612314000065 http://www.sciencedirect.com/science/article/pii/S0079612314...