{TAIL ~ The pounding movement} of the bar screen now drives the ice downward and {HEAD ~ the buoyant force} of the water returns them to the bar screen 
{ TAIL ~ The pounding movement } of the bar screen now drives the ice downward and { HEAD ~ the buoyant force } of the water returns them to the bar screen
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH