a metering roll positioned to contact {HEAD ~ grain} advancing out of {TAIL ~ said discharge opening} of said grain column, wherein said metering roll has a vane diameter equal to VD, and VD≧6.0 inches 
advancing out of
a metering roll positioned to contact { HEAD ~ grain } advancing out of { TAIL ~ said discharge opening } of said grain column , wherein said metering roll has a vane diameter equal to VD , and VD≧6.0 inches
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH