The damper man installs the dampers, blocks with felt pads that rest on the strings and "damp" the sound. When a key is pressed down, a metal rod lifts the damper off the strings for that note, allowing them to vibrate. When the key is released, the damper automatically returns to the strings to stop them form vibrating. The highest notes on the piano have no dampers, because their short strings don't vibrate for long enough to make the dampers necessary.
When the piano's right pedal is pressed, all the dampers are raised, so all the strings can vibrate. All the notes that are played continue to sound until the pedal is released and the dampers ret run to the strings.The middle pedal lifts only the dampers for those notes being played at the time the pedal is pushed. When the left pedal is pushed down, all the hammers move slightly to one side so that they strike fewer strings, making a softer sound. The damper man carefully adjusts all the dampers until they rest on the strings with the same amount of pressure and move up and down with the same speed. While the dampers are being installed, other workers are making the piano case ready for the finishing- with stains and lacquers.

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