Assertion: windmill's sail | /r/HasProperty | attached by horizontal struts
Facets:
value: to a vertical shaft
type: TRANSITIVE-OBJECT
value: with a stone for grinding purposes
type: PURPOSE
Source sentences:
text: The earliest documented windmills were vertical axis systems, with vertical sails made from reeds or wood that was attached by horizontal struts to a vertical shaft with a stone for grinding purposes.
text: This design was the panemone, with vertical lightweight wooden sails attached by horizontal struts to a central vertical shaft.