Upright piano action

Upright piano action
Upright piano action: upright piano internal operation.
Felt: cloth surrounding the hammer.
Hammer: piece that hits the string to make it vibrate.
Hammer rail: hammer support when it is not operated.
Catcher: piece that catches the hammer tail when it falls.
Back check: piece that catches the hammer tail when it falls.
Key: part of the keyboard that is pressed to produce a note.
Wippen: piece to which the strings are attached and that transmits the sound to the soundboard.
Jack: piece that sends the hammer head towards the string.
Hammer butt: part of the hammer that is pushed by the jack.
Spring rail: support for the damper when it is not operated.
Damper: piece that prevents the string from vibrating.
String: part of the piano that produces the sound by vibration when hit.

Photo :

EN : Bells (ceramic)
FR : Cloche
ES : Campana


A bell is a simple sound-making device. The bell is a percussion instrument and an idiophone. Its form is usually an open-ended hollow drum which resonates upon being struck. The striking implement can be a tongue suspended within the bell, known as a clapper, a small, free sphere enclosed within the body of the bell, or a separate mallet. Bells are usually made of cast metal, but small bells can also be made from ceramic or glass. Bells can be of all sizes: from tiny dress accessories to church bells weighing many tons.