Assertion: violin's string | /r/HasProperty | stretched in the two lines
Facets:
value: always
type: TEMPORAL
Source sentences:
text: Helmholtz motion for a bowed violin string: an illustration of Helmholz's diagram of the motion; and a clip showing the 'Helmholtz corner' travelling back and forth 1 b and bc 2 a, and the string itself is always stretched in the two lines
text: The foot d of the ordinate of its highest point moves backwards and forwards with a constant velocity on the horizontal line ab, while the highest point of the string describes in succession the two parabolic arcs acb and bca, and the string itself is always stretched in the two lines acand bcor acand bc.