Assertion: piano's mechanism | /r/HasProperty | pneumatic
Facets:
value: with providing a source of vacuum
type: CAUSE
Source sentences:
text: A player piano (also known as pianola) is a self-playing piano, containing a pneumatic or electro-mechanical mechanism that operates the piano action via programmed music recorded on perforated paper, or in rare instances, metallic rolls, with more modern implementations using MIDI.
text: The mechanism that finally came into widespread use in the 20th century was all-pneumatic, with foot-operated bellows providing a source of vacuum needed to operate a pneumatic motor driving the take-up spool while each small inrush of air through a hole in the paper roll was amplified in two pneumatic stages (the so-called double valve mechanism) to sufficient strength to strike a loud note.
text: A player piano (also known as pianola) is a self-playing piano, containing a pneumatic or electro-mechanical mechanism that operates the piano action via programmed music recorded on perforated paper, or in rare instances, metallic rolls, with more modern implementations using MIDI.
text: The mechanism that finally came into widespread use in the 20th century was all-pneumatic, with foot-operated bellows providing a source of vacuum needed to operate a pneumatic motor driving the take-up spool while each small inrush of air through a hole in the paper roll was amplified in two pneumatic stages (the so-called double valve mechanism) to sufficient strength to strike a loud note.