The Appalachian dulcimer has a good few Northern European ancestors, some scarcely distinguishable from it. It was probably introduced to America by Scandinavian immigrants, though forms are also known in France and Germany, for example. The Glass Harmonica was an improved, mechanised form, developed by Benjamin Franklin (and called by him Armonica), of the "musical glasses" popularised by Gluck and Pockrich some years earlier. It wasn't new when they toured the theatres with it, though.