Assertion: hammer's part | /r/HasProperty | the result of inertia
Facets:
value: purely
type: DEGREE
Source sentences:
text: It used levers to magnify the small motion of the piano key into a large motion of the hammer, and was arranged so that the very last part of the hammer's motion before striking the string would be purely the result of inertia and not propelled by the key; this prevents the key from pressing the felt-covered hammer firmly into the string, which would damp and stop the string vibrations and the sound.