Assertion: gunpowder | /r/HasProperty | proved
Facets:
Source sentences:
text: Again, in 1623, nominally in order to prevent the sale of weak or defective powder, a proclamation was issued by James I., prohibiting its manufacture, as well as that of saltpetre, except under the king's commission, and directing that all gunpowder should be proved and marked by the sworn proof-master.