Assertion: blasting cap's charge | /r/HasProperty | provided with proper cavity
Facets:
value: at the base
type: LOCATION
Source sentences:
text: As further illustration of the increased effectiveness obtained when the preformed explosive charge is provided with a proper cavity at the base, craters having volumes of 0.30 cc. and 0.50 30 cc. respectively were produced when caps of types 1 and 5 above were fired on % inch thick lead plates.