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
Paris in the 18th century The old city gates were replaced by ceremonial arches, celebrating his victories; the Porte Saint-Denis (1672) and Porte Saint-Martin (1674). The walls were pulled down and replaced by wide boulevards, which in the 18th century became the most popular promenades for Parisians. The administration of the city was complicated and deliberately divided, designed to keep the city tightly under royal authority. The position of Governor of Paris, held by a duke, was purely ceremonial, as was the position of the Provost of Paris, earlier held by a leading merchant, but in the early 18th century by a nobleman. Their powers