The action then transfers the pianist's blow to the hammers, which are made out of wood covered with felt, and they then strike the strings. The strings vibrate and create the pitches (notes) at various frequencies. The strings are held in place by steel tuning pins driven into a thick piece of wood called a pinblock. It is important that the pinblock grips the tuning pins tightly enough that the strings stay in tune, but it must also allow the pins to move enough that the piano technician can turn them and tune the piano. The strings are connected at one end by the tuning pins and pinblock. The strings pass over the bridge transferring the vibrations of the strings to the soundboard and are attached at the other end to the cast iron plate.
GRAND PIANO VIEWED FROM ABOVE
The soundboard is usually made of spruce and acts like an amplifier, enhancing the tone of the strings. The cast iron plate holds the tremendous tension of all the strings. Finally, the case contains all the parts and keeps the soundboard taut.
GRAND PIANO STRUCTURE
The Piano Book, A Guide to Buying a New or Used Piano by Larry Fine
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