PIANOS

Support  for  the  Strings

                    In order to prevent this warping, the strings had to be kept at a lower tension, resulting in a softer sound. Before advances in metallurgy, the frame was made of wood, which would bend and warp under high string tension.

               The cast-iron frame, also called the plate or harp, is responsible for sustaining the massive tension of the strings.

                                     The development of the cast-iron frame in the mid 1800's allowed the strings to be held at a much higher tension, resulting in the big sound of the modern grand piano Today's frame is capable of withstanding string more tensions  

                                                                                                                                                      
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