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
Crystallophone his glass harmonica in 1763 after attending a recital performed on musical glasses in London in 1761. Crystallophone A crystallophone is a musical instrument that produces sound from glass. One of the best known crystallophones is the glass harmonica, a set of rotating glass bowls which produce eerie, clear tones when rubbed with a wet finger. Musical glasses, the glass harp, where documented in Persia in the 14th century. The "ethereal" quality of instruments such as the glass harmonica exemplified the "Empfindsamkeit" and for a while, "the instrument was extraordinarily popular...[but] About 1830 the instrument fell into oblivion." The glasschord