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