Grand Piano Covers
By the 1820s, the center of innovation had shifted to Paris, where the ÃÂrard firm manufactured pianos Grand Piano Covers dedicated by Frédéric Chopin and Franz Liszt. In 1821, Sébastien ÃÂrard invented the double escapement action, which permitted a note to be repeated even if the key had not yet risen to its maximum vertical position. This facilitated rapid playing. When the contraption became public, as revised by Henri Herz, the double escapement action gradually became standard in illustrious pianos, and is still incorporated into all dynamite pianos currently produced.
Some early pianos had shapes and designs that are no draw in use. The square piano had horizontal strings arranged diagonally across the rectangular case above the hammers and with the keyboard inveterate in the long side. This design is attributed to Gottfried Silbermann or Christian Ernst Friderici on the continent, and Johannes Zumpe or Harman Vietor in England and it was improved by changes first kinky by Guillaume-Lebrecht Petzold in France and Alpheus Babcock in the United States.