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 business, but all important decisions had to be made by the King and his council. Despite the grandeur of the new monuments, the center of the city at the beginning of the 18th century was overcrowded, dark, unhealthy, and had little light, air, or drinking water. It was also dangerous, despite the addition of the first metal lanterns on the main streets and the enlargement of the police night watch to four hundred men. The last years of the King's long reign were marked by natural catastrophes which caused great suffering for the Parisians; they began with a bad harvest