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 as far away as Saint Petersburg. An important feature of the Paris literary world was the literary salon, where wives of the nobility invited their friends to their homes to hear readings of new books and to discuss literature, and, later in the century, politics. The first famous Paris salon of the 18th century was that of Madame de Lambert in her town house on rue Richelieu in 1710, followed by those of Madames de Tencin, Geoffrin, Du Deffand, d'Épinay, Helvétius, and Necker. The Revolution brought an abrupt end to the literary salons, as the aristocrats were executed or forced