Assertion: sounding board | /r/HasProperty | thin panel
Facets:
value: very
type: DEGREE
value: from 3/8 of an inch
type: OTHER
value: necessarily
type: MANNER
Source sentences:
text: So that it will vibrate freely, a sounding board is necessarily a very thin panel, usually from 3/16 to 3/8 of an inch thick.
text: The soundboard is a thin panel of spruce that underlies the strings and the cast iron plate and rests on the rim braces.