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