Assertion: catapult's arm | /r/HasProperty | vitruvius c.
Facets:
Source sentences:
text: BC Mark IVb, stone-projector built according to formula for stone-projectors Heron/Philon c. 270 BC Modified Mark IVa, arrow firer curved arms Vitruvius c. 150 BC Mark Va, arrow-firer oval washers Vitruvius c.