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 them in 1714; groups of six, moored two by two, were anchored across from Notre Dame, near the Pont Saint-Michel, and near the rue de l'Hôtel-Colbert. They preferred to be on the right bank, so the sunshine could dry the laundry. In the 18th century only the nobility and wealthy had bathtubs in their homes, at the Marais and Faubourg Saint-Germain, the fashionable districts of the time. Other Parisians either did not bathe at all, bathed with a bucket, or went to one of the public bath houses, which provided hot tubs of water for a fee. They were heavily