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 18th century were both always short of cash. While the nobles tended to dress in rich and elaborate costumes and bright colors, the bourgeois wore rich fabrics but dark and sober colors. The bourgeois played a very active role in each neighborhood; they were the leaders of the religious "confréries" which organized charitable and religious activities for each profession, managed the finances of the parish churches, and ran the corporations which governed each profession in Paris. Some professions were able to advance up the professional and social scale. At the beginning of the 18th century, doctors were members of the