When the cavity is distended by being partially filled, the entire container, except for a transition zone, presents {TAIL ~ a smoothly arcuate surface} of {HEAD ~ the frustum} of a cone 
When the cavity is distended by being partially filled , the entire container , except for a transition zone , presents { TAIL ~ a smoothly arcuate surface } of { HEAD ~ the frustum } of a cone
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH