glass harmonica

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A musical instrument consisting of a set of graduated glass bowls on a rotating spindle that produce tones when a finger is pressed to their moistened rims.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun music A musical instrument composed of a series of spinning glass bowls, played with the fingers, invented by Benjamin Franklin. See armonica.