Ernst Chladni at the understanding of electron orbitals. Since at least 1738, a musical instrument called a "Glasspiel" or "verrillon", created by filling beer glasses with varying amounts of water, was popular in Europe. The beer glasses were struck by wooden mallets shaped like spoons to produce "church and other solemn music". Benjamin Franklin was sufficiently impressed by a verrillon performance on a visit to London in 1757 that he created his own instrument, the glass armonica, in 1762. Franklin's armonica inspired several other instruments, including two created by Chladni. In 1791, Chladni invented the musical instrument called the "euphon" (not to
Harmonica latter "Handharmonika," which translate as "mouth harmonica" and "hand harmonica." In Scandinavian languages, an accordion is called variants of "trekkspill" (pull play) or "trekkharmonika" whereas a harmonica is called "munnspill" (mouth play) or "mundharmonika" (mouth harmonica). The names for the two instruments in the Slavic languages are also either similar or identical. The harmonica shares similarities to all other free-reed instruments by virtue of the method of sound production. The glass harmonica has the word "harmonica" in its name, but it is not related to free-reed instruments. The glass harmonica is a musical instrument formed from a nested set of