Assertion: paper's material | /r/CapableOf | line mould
Facets:
value: for cannonballs
type: PURPOSE
Source sentences:
text: During the reign of Elizabeth I (1558–1603), Borrowdale graphite was used as a refractory material to line moulds for cannonballs, resulting in rounder, smoother balls that could be fired farther, contributing to the strength of the English navy.