Assertion: walnut | /r/HasProperty | necessary
Facets:
value: to watch the direction of feed
type: PURPOSE
value: with figured crotch wood
type: OTHER
Source sentences:
text: Light: when the walnut is being formed, it is necessary to consider the best possible use of light, which is essential for good production.
text: With figured crotch wood it is necessary to watch the direction of feed, in both thickness planers and jointers.