A vacuum device 38 may be used to vacuum the particulate matter from the outer surface of rotary screen 36 as {HEAD ~ the screen} rotates past {TAIL ~ the vacuum} 
A vacuum device 38 may be used to vacuum the particulate matter from the outer surface of rotary screen 36 as { HEAD ~ the screen } rotates past { TAIL ~ the vacuum }
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 REL TAIL TAIL TAIL TAIL TAIL TAIL