The piano is an acoustic, stringed musical instrument invented in Italy by Bartolomeo Cristofori around the year 1700, in which the strings are struck by hammers. It is played using a keyboard, which is a row of keys that the performer presses down or …
1720 fortepiano by Italian maker Bartolomeo Cristofori, the world's oldest surviving piano. Metropolitan Museum of Art, New York City.
Duplex scaling of an 1883 Steinway Model 'A'. From lower left to upper right: main sounding length of strings, treble bridge, duplex string length, duplex bar (nickel-plated bar parallel to bridge), hitchpins, plate strut with bearing bolt, plate hole.
The mechanism and strings in upright pianos are perpendicular to the keys.