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
Christianity in the 18th century the Tsar. Christianity in the 18th century Christianity in the 18th century is marked by the First Great Awakening in the Americas, along with the expansion of the Spanish and Portuguese empires around the world, which helped to spread Catholicism. Historian Sydney E. Ahlstrom identified a "great international Protestant upheaval" that created Pietism in Germany and Scandinavia, the Evangelical Revival, and Methodism in England, And the First Great Awakening in the American colonies. This powerful grass-roots evangelical movement shifted the emphasis from formality to inner piety. In Germany it was partly a continuation of mysticism that had emerged in the