FIG_012 [ piano action, one key ]How one piano key works

One piano key: a simplified grand-style action Press and hold the key below, or hold Space. The wooden key pivots on its balance rail. Each story step adds a mechanism: escapement, a damper, and a backcheck. Motion is slowed and geometry is schematic. steel string keybalance rail / fulcrum hammer SIDE CUT-AWAY motion slowed · not to scale Press. Hold. Listen to the problem.
or hold SPACE
key: uphammer: readydamper: not fittedstring: silent